Wow! This is super polished and I'm getting some awesome hollow knight vibes. I love that you were able to get a boss fight in and that he telegraphs his attacks with voice lines! Although the voice lines did get a little repetitive after a while.
The main suggestion that I have is that the boss move where he spawns more enemies seems a little difficult, I found my success in the fight was more tied to how many times he used that move and not how well I was actually doing.
Overall a fantastic game, well done!!