game-states.txt
Add proper state handling to my game: <paste the loop>

States: menu, playing, paused, game over. One `mode` field, and both
update and draw switch on it.

- Pause on Escape and on the window losing focus — a tab switch must
  not run the game invisibly.
- Paused freezes update but keeps drawing, with an overlay.
- Game over shows the score and restarts without a page reload.
- Restart resets state cleanly. Tell me what has to be reset that's
  easy to miss — timers, event listeners, spawned entities.

Menu and game over must be keyboard and touch navigable, not
click-only.

Pausing on blur is the one people forget. A player who alt-tabs for two minutes should not come back to a dead character.