Really nice implementation! I like the music, and the graphics are neat in a minimalistic way. The gameplay is also very clever and well implemented.
Some of the levels feel a bit too spacy, I felt a couple of times that the level might've been better with less diamonds and a bit tighter game area. This was especially present in the first levels.
All in all, I really like this.
This might also work rather well with the MMF 2 flash porter, seeing that it's fully mouse-driven!