Dodge or shoot cannonballs as you descend to the planet. Score a point for every cannonball you dodge or shoot. The higher your score, the faster the cannonballs move. Use WASD to move, and the arrow keys to fire arrows. For strategy--I kind of thought all you'd have to do is fire downward all the time, but that doesn't actually work. Not perfectly, anyway.
Aaron Cavanagh made The Impossible Game, and then HalfBear turned it into The Floating Game. I added bi-directional motion and the cannonballs and the arrows. it looks pretty different from Aaron's game but a lot of the behind-the-scenes stuff came from it. HalfBear did the cool spacey backdrop and some other stuff. There's a tiny bug with the score, where it keeps adding after the game ends. But it sets the WR before then, so that's why sometimes your score will exceed the high score. I think if I put a stop in there somewhere it will fix it, but the game works so I'm afraid to try it.