Lovely game! The mechanics feel good, level and boss fight are well designed. The art is super cute and I love Kutaka's animations. For such a short game it offers good replay value and speedrunning potential. I would love a longer version of this, but it is fine as it is. The only thing I miss is a quick way to start a new run other than exiting and restarting the game.
I'll definitely check out your other games and look forward to your future releases.