This is really nice. I like the mechanics, they feel very good. I also Really like the audio and art. I think the only thing that bothers me is that if you lose your 3 lives you restart the level. Personally, I like to have infinite tries without level restarts. Of course this is just my personal preference, and I know some people who prefer it the way it is.
It is also very impressive that you managed all of this in just a week!
Overall, very good job!