Fun game, great idea. Gameplay is already pretty addictive: got to wave 14 on my first try and might go back for more after I try some other demos. As others have said, keep working on the sprites as the graphics don’t quite gel yet: turret timers and the upgrade buttons stood out in particular (which in many ways may be a good thing once the action gets frantic so I don’t know if I even agree with my own criticism).