One gesture, one rule
Slide left or right anywhere: the drop follows your thumb directly, no inertia, no button, no timer, no lives. Only one thing ends a game: touching a blade. Touching the walls never does. The blades always close behind you, never in front of you. The pace never speeds up and the gaps never shrink: only their positions change, so your thumb always does the same easy work. A game ends? A new one starts by itself a moment later, no screen in between. Every layout is checked so that a gentle correction is always enough.