Hey there! This is an amazing and well designed boss fight. The controls feel super responsive and any error done doesn't make me blame it on the game but rather my own skill. The art is also super gorgeous and looks really polished so well done on that! The telegraphs are really nicely timed and doesn't feel unfair to the player especially given the dash. The music is also pretty well done and fits the vibe.
Now one small critique I have is that it should be more evident when the player loses health, cause right now it's pretty much the same. Maybe a bigger screen shake or a sound effect plays?
This game also has a lot of potential to add extra abilities, weapons, etc. but that seems more like a post game jam goal.
But yeah, this game was amazing and I enjoyed it!