I really like this. Got to level 16 with about 2000 power to spare on my first attempt, but got tired and quit. This game is really long and could use a save feature. Moreover, The first 10 levels or so could be harder, it's very tedious to play through that many easy levels just to get to the point where the game is actually challenging.
I would really like to see you add hotkeys. I find the Four Leaf Clover to be often the cheapest way of getting out of a pinch but since you may need to use it several times to get what you want, it's annoying to have to reselect it all the time.