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Eduardo CastellanoAI Engineer

For indie developers and small studios

I’m Eduardo. Your game, one milestone at a time.

Design documents, 2D art, playable prototypes, tests and your store page.

  • Your idea, code and assets stay yours
  • AI-made assets are labeled
  • English and Spanish

Scope 2D and casual 3D · web, PC and mobile · prototypes and vertical slices · no AAA or MMO

mosslight · build 0.4 · webPlayable
Play in browser
WebPCMobileIllustrative example · fictional game

What I make for your game

Players decide in seconds whether to try a game. Give them something they can play.

Negotiable price: tell me what you need and I’ll quote you. I deliver fast and in volume.

  1. 01Game designDesign document, levels, economy and UI
  2. 02Playable buildsPrototype, vertical slice and online features
  3. 03Art, music and voices2D sprites, 3D characters and sound
  4. 04Milestones and testsQA, builds, fixes and updates
  5. 05Store and launchStore kit, trailer, website and live ops

01 · Game design

I put your game on paper before anyone builds it.

  • BeforeAn idea that changes every week
  • AfterA 10-page design document with mechanics, audience and scope
  • What stays out of scope is written down too, so every milestone has a clear limit.
  • Level plans, economy balance and working UI screens are pieces you can add.

Eduardo presentsIllustrative example · choose a stepFictional game

Sample

Mosslight · design document · v1

A short 2D platformer about lighting the way home.

Core loopExplore → collect light → open the next path
Audience and platformCasual players · web and PC · about 2 hours
Level 1 · The meadowTutorialPlanned
Level 2 · The caveKeys and torchesPlanned
Level 3 · The towerTimed lightIdea
Out of scopeOnline multiplayer, 3D, console ports
10 pagesShared documentYour approval

02 · Playable builds

You decide by playing, not by reading files.

  • BeforeA design nobody has played yet
  • AfterA build you open in the browser and play
  • A prototype is one mechanic and one scene. It is not the full game.
  • A vertical slice is defined and quoted milestone by milestone before work starts.
  • Accounts, leaderboards and matchmaking are quoted with their monthly hosting cost.

Eduardo presentsIllustrative example · choose a stepFictional game

mosslight · build 0.4 · web
Level 1 · The meadowNew: double jump
Playtest · 3 players2 of 3 finished the level. The second jump felt late; it now triggers earlier.
Build 0.4Double jump and checkpointsPlayable
Play in browserBuild notesTested

03 · Art, music and voices

Characters, props and sound in your game’s style.

  • BeforePlaceholder art and borrowed sounds
  • After10 sprites from one family, ready as sprite sheets
  • Every asset comes with its licence; voices need the consent of each person who speaks.
  • 3D characters, rigs, environments and interactive music are quoted first.

Eduardo presentsIllustrative example · choose a stepFictional game

assets · mosslight · forest family
Style referenceYour palette, two sketches and a 16-pixel grid.
In the cave level
Hero · idle, run, jumpReady
Slime, chest, key, crateReady
Coin, heart, torchIn review
PNG + sprite sheetLicensed for your gameAI-made · labeled

04 · Milestones and tests

Each milestone ends in a tested build.

  • BeforeBugs your players find first
  • After20 test cases and the steps to reproduce each bug
  • Hotfixes and scoped updates protect saved games and can be rolled back.
  • Localization and accessibility are checked inside the build, on screen.
  • Console builds require the manufacturer’s approval.

Eduardo presentsIllustrative example · choose a stepFictional game

milestones · mosslight

Milestone 3

The player can cross the cave from start to finish.

Functional QA · 20 casesBuild 0.5 · web18 / 20
Bug 2 · reproducible1. Open the chest in the cave · 2. Pause · 3. Resume → the key disappears. Saved games are not affected.
Fix for bug 2Retested · 20 / 20Passed
Approve milestoneAsk for a changeNext milestone

05 · Store and launch

Your store page, trailer and site, ready for players.

  • BeforeA store page made the night before launch
  • AfterCapsule art, screenshots and a 15-second gameplay trailer in the store’s sizes
  • You publish, or approve publishing, from your own account.
  • Anything in the trailer that is not gameplay is labelled on screen.
  • After launch: live events, player support and feedback turned into tasks.

Eduardo presentsIllustrative example · choose a stepFictional game

store page · mosslight

Mosslight

Light the way home through meadows, caves and an old tower. A short, calm platformer for one player.

PlatformerPixel artCasualSingle player

Trailer · 15 s from your gameplay

Add to wishlist

You publish from your account, or approve publishing.

Eduardo · your game partner

Tell me what your game needs. Then play the result.

Eduardo
  1. 01 · You ask

    Use voice, text or files.

  2. 02 · I make it

    Follow each milestone in your project.

    Inside your project

    Milestones, builds and decisions in one place.

    • Ask: share your idea by voice, text or files.
    • Direct: follow each milestone and ask for changes.
    • Play: open every build, then approve it or ask for another pass.
    Eduardo › Mosslight · milestone 3
    WorkDeliverablesReviews
    You askReceived
    • Idea · level 2 in the caveText
    • Two sketches and the paletteFiles
    • Platform · web and PCPreference

    Your idea, files and platform, in one project.

    ContinueAdd files
    Eduardo › Mosslight · milestone 3
    WorkDeliverablesReviews
    Milestone 3Awaiting your OK
    • Cross the cave from start to finishIn scope
    • Keys open doorsIn scope
    • Online leaderboardOut of scope

    One clear goal: what the player can do at the end.

    DoneAsk for a change
    Eduardo › Mosslight · milestone 3
    WorkDeliverablesReviews
    Build 0.5Playable
    • Web buildReady
    • Build notesReady

    Open it and play. The notes say what changed.

    PlayAsk for a change
    Eduardo › Mosslight · milestone 3
    WorkDeliverablesReviews
    20 test cases18 passed
    • Movement and jumps8 / 8
    • Keys, doors and chests5 / 6
    • Pause and resume5 / 6

    Two bugs, each with the steps to reproduce it.

    Fix bothSee report
    Eduardo › Mosslight · milestone 3
    WorkDeliverablesReviews
    Your decisionDelivered
    • Build 0.5 · 20 / 20 testsPassed

    Approve it, ask for a change or set the next milestone.

    DoneAsk for a changeNext milestone

    Illustrative walkthrough with a fictional game. Choose a stage to see how a milestone moves forward.

  3. 03 · You get it ready

    Open every build and ask for changes.

    • “Make my idea playable”A prototype with one mechanic and one scene, to play in the browser.Before: weeks of setup before the first test.
    • “I need the sprites for level 2”Ten sprites in your game’s style, ready as sprite sheets.Before: placeholder art and a long backlog.
    • “Why do players quit at the cave?”With your player data connected, it shows where they drop off and what to try next.Before: guessing from a few comments.
    • “Get my store page ready”Copy, screenshots and capsule art in the store’s sizes, for you to publish.Before: a rushed page the night before launch.

Honest scope

What Eduardo makes, and what it doesn’t.

Eduardo makes

  • 2D and casual 3D games
  • Prototypes for web, PC and mobile
  • Vertical slices and milestones on your existing game
  • Art, music and voices with their licences
  • Tests, store pages, trailers and updates

Eduardo doesn’t make

  • AAA productions or MMOs
  • Console builds without the manufacturer’s approval
  • Publishing anything without your approval
  • Real-money gambling mechanics
  • Promises of sales, wishlists or rankings

Before you decide

Frequently asked questions

Who owns the game?
You do. Your idea, your code and the assets delivered to you are yours, and each asset comes with its licence.
What kind of games does Eduardo make?
2D and casual 3D games for web, PC and mobile: new prototypes, vertical slices and milestones on games already in progress. Not AAA productions or MMOs.
Which engine do you use?
For an existing project, Eduardo works in your engine when it is compatible; for a new prototype, it proposes one suited to your platform. This is confirmed before work starts.
What is a milestone?
A defined step: what the player can do at the end. It is delivered as a tested, playable build, and you approve it before the next one.
Do you publish my game on Steam or other stores?
No. We prepare the store kit, demo or beta branch; you publish from your own account or approve publishing. Store fees and permissions are yours.
Do you use AI?
Yes. AI-made assets are labeled, and we follow each store’s disclosure rules.
How many copies will my game sell?
We don’t promise sales, downloads or rankings. Eduardo moves your game forward and gets it ready for its store.
We’re a larger studio.
You can request a scope tailored to your team and milestones. Write to me.
Request a proposal

Order it and we agree on the price.

Negotiable price: tell me what you need and I’ll quote you. I deliver fast and in volume.