Use the arrow keys to move, you will automatically jump when you land on the platform. You can alternatively use a and d to move. Don't touch the bombs (bombs are never good) and beware of moving platforms! Use space to shoot, although it doesn't really do any good. If you find it really laggy, go back to the menu and click the "color" button, it will reduce lag, but unfortunately removes the pretty colours :(
Sounds are mostly from SoundBible, except for music tracks, which I found on freeSFX: http://www.freesfx.co.uk/soundeffects My record is 24 ;) Try to beat me!