Midjourney for Indie Game Devs: Characters, Environments, UI, Store Art

The problem

You have a working prototype. The art is placeholder shapes you grabbed from itch.io and a hero sprite you made in MS Paint to test movement. You know the next blocker is art — you cannot ship without characters, environments, UI, a Steam capsule, marketing screenshots, and a press kit — and you cannot afford a real artist on a six-month runway. Every Midjourney prompt you try generates one decent image and then nothing else that looks like the same game. The hero’s face changes every generation. The environments do not match. The UI looks like it came from three different games.

The problem is not that Midjourney is bad. The problem is that the prompts you are using are designed for one-off concept art, not for game assets that need to share a visual language. Game devs need style consistency above almost everything else — a character who is recognizably the same in three angles, environments that read as belonging to the same world, UI that matches the character art. The prompts in this book are built around that constraint.

What most people get wrong

They write prompts for “concept art” when they need “asset bibles.” A concept-art prompt is a one-shot creative explosion: “moody knight in a foggy forest, dramatic lighting.” It looks great once. The same knight in a different prompt is a different person. Game devs need the style reference layer — saving the first generation, then using --sref to anchor every subsequent character to that style. The book covers the exact workflow: generate the hero with a long descriptive prompt, save the seed and the --sref reference image URL, then write a short prompt for every subsequent character that drops the descriptive paragraph and only adds --sref [URL]. The result is six NPCs that visibly belong in the same game.

They generate UI as an afterthought and end up with mismatched art. The cycle goes: gorgeous character art is generated, gorgeous environments are generated, then the UI ends up being default Unity buttons because by then “I just want to ship.” That UI breaks the player’s immersion harder than any other art choice. The fix is the prompt order — generate the UI palette and frame style alongside the character art, using the same style reference. The chapter on UI covers icons (16 sizes from one prompt), health/mana bars, menu backgrounds, button frames, and complete UI kit generation in a single batched prompt.

A working approach

The book is structured around the seven asset categories an indie game ships. Here is the character turnaround prompt, exactly as it appears in chapter 2:

character turnaround sheet, [character description: race, role, age,
build], [outfit details], [weapon/gear if any], shown from front,
3/4 view, side, and back, all four angles on transparent or neutral
background, [art style — e.g., painterly 2D, pixel art, low-poly 3D],
consistent proportions across all four views, character expression
neutral, --ar 16:9 --style raw --v 6 [--sref URL_IF_FOLLOW_UP]

The four-angle output gives you what game artists call a turnaround sheet — the same character from front, three-quarter, side, and back. The --sref parameter is what makes it consistent with the rest of your character roster.

The seven situations:

1. Character design and turnarounds — turnaround sheets, expression sheets, class variations, pixel-art characters, NPC crowds, enemies, bosses
2. Environment and world building — biome design system, parallax layers, tileable elements, day/night variations, skyboxes
3. UI/UX elements and icons — icon sets, health and mana bars, inventory backgrounds, button frames, title cards, full UI kits
4. Marketing assets and store pages — Steam capsule art, social media assets, devlog images, trailer thumbnails, seasonal promo art
5. Style consistency techniques — style reference (--sref), seed locking, character reference (--cref), prompt templates, negative prompting
6. The complete prompt library — paste-ready prompts for every asset type
7. The parameter cheat sheet — every Midjourney flag with what it does and when to use it

The style-consistency chapter is the chapter that separates “I made some AI art” from “I shipped a game with a coherent visual identity.” It covers --sref (the most powerful single Midjourney parameter for game devs), seed locking for structural consistency, character reference (--cref) for keeping the same face across generations, and the negative prompting list that strips Midjourney’s defaults you do not want — “blurry, watermark, signature, low quality, deformed hands” and the longer game-specific list in the book.

The Steam capsule chapter is the chapter you read the week before launch. Capsule art is the single biggest conversion lever on a Steam store page; it determines whether the wishlist drops a coin in the bucket or scrolls past. The prompt accounts for the four sizes Steam requires (capsule, header, library, hero), the readability constraints at thumbnail size (your text overlay must work at 200px wide), and the genre-anchor visual cues that signal what game this is in two seconds.

Where this scales

The article walked through the character turnaround prompt and the seven asset categories. The book has the parallax-layer prompts that build seamless side-scrolling backgrounds in three layers, the tileable-environment prompts that fix the seam problem most AI environment art has, the boss-design prompt that scales appropriately for “final fight” presence, and the complete prompt library — paste-ready, parameterized, ordered by what you actually generate first.

The parameter cheat sheet is the closing chapter. It is the page you keep open in a tab while working. Every flag — --ar, --style, --v, --s, --cref, --sref, --no, --seed, --tile, --c — with what it does, when to use it, and the cost/quality trade-off.

Included with the book

• Midjourney Game Assets (markdown and PDF) — the complete prompt library as a single reference file, paste-ready for every asset category, with the parameter cheat sheet

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Questions readers ask

Will Steam reject AI art?

Steam updated its policy in 2024 to allow AI-generated content with disclosure. The press-kit chapter covers the disclosure language. Many indie titles ship with AI art today.

What if I need a refund?

Checkout runs on Lemon Squeezy. The standard refund window applies. You keep the PDF either way.

Do I need Midjourney's most expensive plan?

No. The Standard plan covers what most indie devs need. The Pro plan adds Stealth mode (private generations), which is worth it only when you want the assets to stay private until release.

How does this compare to using Stable Diffusion locally?

Stable Diffusion is more flexible and free at the cost of setup time and consistency. Midjourney is faster, more consistent, and more polished out of the box. Most indie devs use Midjourney for production art and Stable Diffusion for iteration. The book is Midjourney-specific.