It took me 2 minutes to figure the system out, It is almost good and I'd like it if I didn't have to wait for like 10 seconds to be able to shoot 3 bullets. When I load my full cylinder into the boss, I have to wait for like 20 seconds for it to fill up again. I managed to wait through the first boss but I couldn't do It for the second too.
Please, figure out something else than waiting around dodging the boss for 10 seconds just to be able to shoot.
The concept was otherwise nice but I didn't have fun waiting. The art was ok, better than mine :P