I absolutely love this game. The concept is great, and everything seems to be perfectly balanced. It's funny and entertaining, even for someone like me who doesn't usually enjoy scrolling arcade shooter games like this one. The one thing I would like to see is the ability to toggle between the upgrade versions. I actually find a certain charm to the mouthed "music" for the first upgrade of the menu and game music, and the blue-haired girl avatar is a lot cuter (to me) than the pikachu one that's the final upgrade. Essentially, give players a choice (once the upgrades are bought) between the different levels. Other than that, wonderful game!