Very nice game! I liked the different power ups and how it wasn't the same dungeon if you died and had to start over. One thing that did happen to me was that after I respawned and played the first level again, I didn't get any power ups. One thing to also maybe consider if your thinking of making more bosses and levels is to maybe have a checkpoint after every boss or every second boss? :) Over all I really enjoyed it and the art style was great! :D
I don't know if you've heard of Game Development World Championship before (gdwc2019) but it's a competition for indie game developers where they can submit their games and it's free! It's great if you want some more visibility for the game and it only takes a couple of minutes to join :)