Nevermind the game concept, the fact that there seems to be no option to reduce graphics quality warrants a 1/5 rating. Basic flash game principles 101!
Maybe i missed it but there really needs to be a way to lower the graphics quality. Everything went to a crawl when there were too many bullets or money on screen.
The tutorial goes on for too long. I don't need you to explain every little game detail. The fun in puzzle games is figuring things out for yourself by trial and error. You take away from that when there's blips all over that say this does this and that does that and so forth. It's good for a couple of rooms to get you started but it's really annoying now.
If you're going to keep score, you need to display it to the user. While playing, it didn't seem like anything was happening, i didn't know if i was accumulating points or not because you don't give any visual cues. Not a bad first try but there's tons of room for improvement.
Great game except there's no penalty for typing the wrong key. For instance, while holding "J," i can type any other button without affect anything. It should break the combo and decrease health.