I think this game is fun and challenging. But, my one complaint would be that you should make the main menu use 1-3 instead of having to use the mouse.
Pretty fun and quick game, but I would have liked to hover tooltips because I had no idea what the differences in weapons and such aside from the fact that they were listed. Maybe a Coin/second at the very least.
Good game. My only problem is that you didn't put in a place to sell in the third area which I feel is an unnecessary time sink. But still fun to play.