Very, Very Fun, Until...
Excellent game and concept.
Great, simple controls.
The only thing that ruined the fun for me was that my shooter-thing would get stuck to a wall for a while and I'd only be able to move along that wall until I push against and away from it a few time till I come loose... and stick to another wall. XD Am I doing something wrong?
Other than that, very well done. I like the upgrade system.
Keep up the good work.