>This was just the last level (slimes) or it's still your overall impression?
It's fine if it's limited to a few levels. Just don't make it the bread and butter of the game.
Also, I just realized that there's no difference between getting hit and using a bomb, except for the (not so useful with the low density and long I-frames) bullet clearing. They both cost the same amount of health and give you the same I-frames.