I'm impressed by the level of polish here. Everything looks and feels premium, especially the SFX. I think you did an excellent job in selecting (or making, I'm not sure) the audio. The art also has a lot of charm.
If I had to nitpick the game, I'd say that tutorial levels would be a better introduction to the mechanics rather than reading the How To Play section, but I'm sure people have pointed this out. Overall, I could see this winning. Very nicely done.