Floppy Fish by Martin Magni is a platformer where you, a floppy fish, must return to the water by means of burping out bubbles. The game has 30 levels.

Gameplay

In order to move, you must tap the screen. This sends out a bubble projectile, and recoils the fish in the opposite direction. Simultaneously, the fish also generates rotational momentum. If the fish faces right, it will spin anti-clockwise, and vice versa. You can jump both on the ground and in mid-air.
In terms of obstacles, the main concern is spikes, which kill the fish upon impact.