Fun game! I like that theres a story aspect to it, and the bosses were actually really unique! Not sure where the exchanging part is, you said that you can exchange life for power ups, but i never got the opportunity to, not sure if was missing something there, and some sound effects wouldve really helped as well. the game feels a bit unfinished, but what is there is actually super cool! i love all the ideas for the bosses (although they might have too much health, it takes a VERY long time to kill them) and the story elements are really nice!