Slime in space must press space in time!
As for the game itself, you are a slime that runs through a "randomly generated" cave. Pre-made tiles are pieced together to make it endless. When you press space on the ground, your gravity flips, inspired by VVVVVV. When you run into a wall or fall into a hole, your high score is recorded. The game is tested on Windows and Linux, but if you have OS X please tell me if it runs.