Interesting concept. After skimming some of the other comments here, I have to agree with what others are saying. I'd like to know before shooting each button, what exactly they do, and maybe a little more time to react, at least in the beginning. The very first go I was frantically pushing buttons trying to figure out what to do while making my way to the right, off the edge towards my inevitable demise. If you teach me what to do first, I'll find it less frustrating when you kill me, as I'll only be able to blame myself.
On a different note, love the art.