Cute little game! The graphics are nice, and I appreciate the effort on the music and sound design, not all jam entries think about adding sounds AND music =).
The puzzles are really simple, but the concept was cool ^^. I think the difficulty curve is a bit too "flat", and needs to be spiced up, but I can understand that it's not that simple with a 7-days jam ^^.
From a game-design perspective, I would have liked if the two kind of buttons ("single press" and "hold") were a little bit different, even if it's a simple color change. They are two different input types and so need to be different.
Overall, that's a nice entry, with some little points to improve, but already showing some good game-making skills. Congratulations =)!