ab56b161fa
Refactor tilemap layers and collision system to consolidate into single floor layer with improved ladder logic and button/barrier interactions
9ac607d2e7
Remove unused review sub‑agent and clarify ES6 import/export usage; differentiate bullet speeds for player and alien; add `Player.die()` to hide the ship and set immediate invincibility; delay player respawn after a hit; introduce dynamic background‑color changes per level.