Drift

Keep it near center.

A single dot near the center of a ring. Now and then something pushes it, slowly, at a moment you cannot predict. One tap takes the push back. The session lasts as long as the dot stays inside, and it ends the instant it leaves.

Nothing gets harder. The pushes are the same size from the first second to the last, the gaps between them are drawn the same way throughout, and the ring never moves. Nothing has to get harder for you to lose. You just have to look away.

The result is a time, your best beside it, and one line. Every tap turns the colour of the ring; nothing else changes colour, because anything else would be a warning or a clock.

WebGPU where the browser has it, and a Canvas2D renderer where it does not, so the game is whole on any phone. No camera, no account, and nothing leaves the machine.