I really liked it ! I would have changed two things on the game would have I think make it easier to playa nd to enjoy. I think the explosion area was a little bit too small making the boss harder because explosion occur too far. I would have also add a mechanic like a key (or something in game but that would require more time) to get back your first appearance instantly. I think that would have open more challenging way to play if wanted without being if the player doesn't want to use it.
Great game :)