Short and sweet! The level design was awesome, you reallly used your mechanic well. I would play it more if it had more levels.
The only thing I didn't like about it was that it has no music, so it feels a little bit empty/ feels like something is missing (and it is, but the sound effects were good). Not a huge complaint, but music would make the game better (I know you probably didn't have the time, but that's how I felt about your game)!