Prune
An infinite, one-input game about what a cut takes: drop the block, and whatever overhangs is gone for good.
Tap to drop the block.
A block sweeps across the top of a tower, and a tap drops it. Whatever overhangs the layer beneath is cut away, and the next block is only as wide as what was kept. The tower is a network, and its width is its weights. Nothing grows back.
Nothing gets harder. The sweep is the same speed at the first layer and the fortieth. The cuts stay small. They just stop having much to cut from.
The card shows the layers, the weights left, and the whole tower as a profile of what was kept and what was cut.
Canvas2D, so the game is whole on any phone. No camera, no account, and nothing leaves the machine.