Jumpinbox

You stick to the inside of a square and an aiming line sweeps back and forth across the room. Tap and you fly along it until you hit another wall, collecting whatever is in the way.

The elegant part is the cost: each launch halves the multiplier you have built up. Firing constantly keeps you safe and keeps your score flat; waiting for the line to reach the one angle that clears four blocks in a row is how the score actually moves.

From Kenta Cho’s MIT-licensed crisp-game-lib collection.