Game over detection: Done. Actual, you know, you ran out of money detection.
Game over dialogue: Done. Restart game or return to lobby when you run out of money.
Swipe to spin: Done. You can now swipe downwards on mobile (left click and drag on web) to spin the reels.
Next up: Pay line display. Ooh boy! That feature has dogged my footsteps for a month now.