GPT-6.1 Terra 對 Claude Sonnet 5.5、Haiku 5.5：最快的 AI，最先倒下

Build a mobile boss-fight shooter in this folder, designed first for a phone held upright.

- One self-contained file: index.html (inline CSS and JS). No external libraries, CDNs, fonts, images or network requests. Draw everything in code.
- Invent your own ship, boss, theme, name and art style. Do not copy characters, names, art or bosses from any existing game.
- Phone first: a portrait layout that fills a 390x844 screen without scrolling or zooming. Touch and drag anywhere to move the ship; the ship sits a little above the finger so the finger doesn't hide it. The ship fires automatically. Mouse drag and arrow keys also work on desktop.
- One boss with three phases. Each phase has its own bullet patterns and gets harder. A boss health bar, hit flashes, explosions and screen shake. Show the player's small hitbox. 3 lives, with a short invulnerability after a hit. A victory screen and a game-over screen, both with a way to play again.
- It should feel good to play and run smoothly on a phone.

You can't ask me questions, so make reasonable choices yourself. Don't install anything (no npm or pip installs, no browser downloads); you may run node to check your logic. When you're done, briefly list anything you're unsure about.

在这个文件夹里做一个手机上玩的打 Boss 射击游戏，按竖着拿手机来设计。

- 只有一个文件：index.html（CSS 和 JS 都写在里面）。不用外部库、CDN、字体、图片，也不发任何网络请求，所有东西都用代码画。
- 飞船、Boss、主题、名字和画风都自己想，不要照搬任何现有游戏里的角色、名字、美术或 Boss。
- 手机优先：竖屏排版，在 390x844 的屏幕里放满，不用滚动也不用缩放。手指在任意位置按住拖动就能移动飞船；飞船在手指上方一点，免得被手指挡住。飞船自动开火。电脑上用鼠标拖动和方向键也能玩。
- 一个 Boss，三个阶段，每个阶段有自己的弹幕花样、一个比一个难。要有 Boss 血条、中弹闪光、爆炸和震屏。显示玩家很小的判定点。3 条命，中弹后有一小段无敌时间。胜利画面和失败画面，都能再来一局。
- 要玩着爽，在手机上跑得流畅。

你没法问我问题，自己做合理的决定。不要安装任何东西（不用 npm、pip，不下载浏览器）；可以用 node 检查逻辑。做完简单列一下你拿不准的地方。

Make it a LOT more fun.

Next update for the boss-fight game in this folder (index.html). Keep everything that already works.

1. Turn the boss's final phase into a true bullet hell: at its peak there should be at least 800 enemy bullets on screen at once, with three new bullet patterns. Add a graze counter (bullets that pass very close to the hitbox without hitting it) and a bomb button with id="bomb" that clears the bullets on screen (2 bombs per life).
2. It must still run at a smooth 60 frames per second on a mid-range phone, even at the peak. Add a small FPS counter that can be switched on and off with a button with id="fps".

Same rules as before: one index.html, no external resources, no installs, no questions. When you're done, briefly list anything you're unsure about.

给这个文件夹里的打 Boss 游戏（index.html）做下一版更新。已经能用的都保留。

1. 把 Boss 的最后一个阶段改成真正的弹幕地狱：最高峰时屏幕上同时至少有 800 颗敌方子弹，再加三种新的弹幕花样。加一个擦弹计数（子弹贴着判定点擦过去、没打中），再加一个 id="bomb" 的炸弹按钮，按下清掉屏幕上的子弹（每条命 2 颗）。
2. 在中端手机上也要稳定 60 帧，最高峰时也一样。加一个小小的帧率显示，用 id="fps" 的按钮开关。

规矩跟上次一样：只有一个 index.html，不用外部资源，不安装东西，不提问。做完简单列一下你拿不准的地方。