Sorry, but I didn't find this game all that great.
Everything seemed either too easy or way unfair. While you could camp and kill enemies for years strait, going out and fighting could easily get you killed quicker than you knew what happened to you. I was never able to make it to the end, no matter how many times I tried, either.
In the technical aspects of the game, the art was okay and the sounds were good. The controls were fine, considering all you have to do is move and rest. I recommend making all the art you use anti-aliased, so that it always looks smooth and adding something else you could do in the game with the controls, like an instant kill all around you that would take up all of your number, but you'd have to have a max of 20 or something before you could do it.