Left and right arrow keys. My high score is 126.873. I've practiced a lot. :) In case you wanted to know, or in case I wanted to brag (:P), my high score for the actual Super Gravitron is 1:59:20. I've practiced that a lot too.
For added epicness, play this song while playing! http://scratch.mit.edu/discuss/youtube/gA9kUMndxc8/ THIS IS NOT MY GAME. It is merely a remake of a game called the Super Gravitron made by Terry Cavanagh. This game is part of a much bigger game called VVVVVV, which my profile pic is from. I highly recommend VVVVVV because it is very challenging and fun. You can download the original Super Gravitron by itself for iOS or Android for free. This remake is easier than the original, although I hope it still proves a challenge. I decided to leave out the warning arrows in an attempt to somewhat offset the easiness. I know it's not an exact replica. Enjoy! P.S. Unfortunately, I can't put in the music (which is fantastic) for copyright reasons. Please understand. ----------------- UPDATES: 8/15/14: Added two new waves that I missed in the first release. Also significantly increased difficulty by reducing space between squares in strings.