OpenGame Plane Shooter

Build an original, small-scope arcade shooter whose main decision is positioning under pressure. Keep the result runnable in a browser and make its game state inspectable enough to test rather than relying on screenshots alone.

Project homepage: https://opengame.app

Start with a bounded brief

Confirm all of the following before coding:

• The target: mobile-portrait or desktop.
• A fresh output directory and a single HTML entry point or an existing project to revise.
• A one-sentence player promise.
• One visible world resource that the player protects, restores, charges, or routes.

For a design-only request, return the player promise, controls, pressure object, threat types, and route/resource choice. Do not create files or claim testing.

Example:

Use $opengame-plane-shooter to create a mobile portrait game called Signal Orchard Escort.
The player weaves through weather debris, collects charge, and spends it in damaged orchard lanes.

Design the playable kernel

1. Give the player continuous two-axis movement by touch/pointer for mobile and keyboard/mouse for desktop.
2. Keep combat simple: auto-fire or one repeated action, so positioning remains the primary decision.
3. Add two readable threat jobs: light rhythm pressure and a slower priority hazard. Make their silhouettes and behavior distinct.
4. Make hits, pickups, danger, and recovery visible in the playfield through motion, damage, particles, color, or world-state changes.
5. Add a route-and-resource decision that changes the active run: take a risky pickup route, enter a timing field, choose which lane to repair, or spend charge where it matters.
6. Escalate density, cadence, speed, and threat mix in readable steps.
7. Provide designed ready, playing, complete or gameover, and retry states.

Invent the world object before naming enemies or pickups. Let it change the verbs and decisions, not only the title, palette, or HUD. Avoid a passive loop where auto-fire and counters rise without the player's movement changing risk or outcome.

Respect the target

Mobile portrait

• Fit a 390px-wide viewport without horizontal overflow.
• Keep touch targets at least 44 CSS pixels and keep critical objects clear of the thumb area.
• Support arrow keys and WASD as fallbacks.
• Keep the player, immediate threats, progress, and pressure readable without tiny labels.

Desktop

• Use the browser space as a scene; do not present a fixed phone card in the center.
• State controls on the ready screen and support keyboard plus pointer input.
• Use wider space for approach distance, lanes, pickups, and route pressure.

Preserve originality and safety

• Use only original, licensed, or procedurally generated visuals, audio, and code.
• Do not copy another game's names, characters, sprites, sounds, HUD layout, enemy formations, level data, tuning, or recognizable identity.
• Do not add analytics, ad SDKs, remote scripts, CDN assets, credentials, or hidden outbound links.
• Prefer vector, canvas, gradients, particles, and original assets over unverified third-party media.

Make it testable

Expose a small debug surface when the project permits it:

window.__opengameDebug = {
  snapshot: () => ({ state, score, health, progress, player: { x, y } }),
  act: (action) => { /* route through real game functions */ }
};

Support start, guide, idle, badInput, and retry, or clear equivalents. Debug actions must invoke the same gameplay state transitions as real input. Test that real input changes state, guided play meaningfully differs from idle play, a terminal state is reachable, retry resets the run, and no external requests occur.

Finish with a concise handoff

Report the output path, target, player promise, controls, route/resource decision, test evidence, and any unresolved human review for feel, visual quality, accessibility, licensing, or IP. Never describe a prototype as release-ready merely because it runs.