Onetap is a wave-based survival game where your character stands at the center of the screen and enemies close in from all sides. Tap anywhere to trigger a radial strike that damages every enemy within range — timing and positioning don't matter, only whether the enemies are close enough when you tap.
Three enemy types attack in waves: basic grunts, fast enemies that move at 1.5× speed, and heavy enemies that require more hits to kill and drop 3 coins. Waves grow larger and spawn faster as you progress. Upgrade your strike range and damage in the shop. Unlock new player and strike color combinations with earned coins. Your HP is 3 — each enemy that reaches you removes one.