🎮 Now Fully Playable on Controller

- Enter friend codes with your controller — D-pad character entry, just like high-score initials. This was the last thing in the game that needed a keyboard, and now it doesn't.
- RETR0 is now marked Full Controller Support on Steam.

🖱️ Mouse Overhaul

- Mouse-look in space finally feels right — tighter, more connected aim. The old floaty drift that made looking feel like sliding sideways is gone. Hand-tuned.
- Mouse fire in top-down runs — left click fires, right click bombs (these did nothing there before).
- Cleaned up leftover experimental mouse-thrust behavior — thrust belongs to your keyboard hand: one hand on keys, one on the mouse, the way PC games play.