The idea and the gameplay is cool and interesting. The tutorial part and the overall progression is well done and allows the player to grasp how to master the core game mechanic. As a player I would expect to destroy the bullet spawners exploding nearby them, but it would reduce the overall game difficulty and I agree with your choice. The sound increasing the speed or the picth the lower the health is in line with the comic game style and I appreciated it a lot. Great work guys ^^