UnderCube
Runs entirely in the browser: no install, no sign-up, on any phone. This game is heading for Google Play — the demo version is open here on the playground.
About the game
Somewhere under a heap of crates there is a hatch. Swipe a crate and it slides until something stops it. Frozen ones are stuck for good. Clear the hatch in as few moves as possible; three arenas, each one tighter.
How to play
Open the game and start right away — no install, no account. On a computer use the mouse or arrow keys, on a phone just tap. Your result is stored on your own device.