Definitely one of the better submissions I have seen. Although I have some comments if you don't mind. 1. Some of the enemies are too strong, on level 2 they just beat me too fast, or even on the first level they are sometime quite tough. 2. I felt that the prices were quite high sometimes, some of the stuff costs 15, but I hardly ever get to that number. Or maybe include more ways to get points to but ? 3 I think that that player and enemies blend too much with the background, make them distinct and separate the colors.
Other than that, this is quite a nice game and definitely better than a lot of submissions I've seen. Great job and keep it up!