Editing Openai/694f5245-1110-800b-b182-7c2accd50046 (section)

==== 你看完如果爽，我們下一步就把你的機戰傭兵橫向卷軸版填進去 🤖🎮 ====

Seed Core 模板：
* App Type: Single-page HTML game (no backend)
* Tech: HTML + CSS + JS (Canvas preferred)
* Goal: Build a playable horizontal side-scroller “Mech Mercenary” game MVP.

===== - 1 sentence pitch: ___ =====

===== - Player accepts a contract → enters a mission → fights enemies → earns credits → upgrades mech → next mission. =====

===== - Move: A/D or ←/→ =====
* Jump: W or Space
* Dash: Shift
* Aim: mouse (or fixed direction if keyboard-only)
* Shoot: Left click (or J)
* Weapon swap: Q/E

===== - HP, Armor, Energy (dash/shoot consumes energy) =====
* 1 stage, 1 boss, 3 enemy types
* 3 weapons (rifle / shotgun / missile)
* Simple upgrade screen between missions (damage / armor / energy regen)

===== - 2000s arcade + mech mercenary vibe =====
* Clean HUD: HP bar, Armor bar, Energy bar, Credits, Weapon icon
* Minimal but readable effects (pixel-ish or flat vector)

===== Must have: playable loop, 1 stage, upgrades, restart on death =====
Must NOT have: login, cloud save, procedural gen, complex physics, story cutscenes

===== - Provide full HTML code in one file. =====
* Include brief instructions at top of file.
* Keep code modular (Game, Player, Enemy, UI).
* Ensure it runs locally by opening the HTML file.

Patch 模板：
* Change request: ___
* Do not change: ___
* Acceptance criteria: ___