Restrictions:
Even though alpha channel might have sounded good, but using it creates other colors. There are times, when multiple sounds are played, which isn't allowed. Also, the mouse...
Other than the restrictions:
The game plays smooth, has a great main mechanic, and is fun. Good job on the visuals, since it's easy to distinguish what's what.
Overall, a fun game, too bad it didn't match some of the restrictions. Nonetheless, enjoyed playing it, great job! :)