Phew, that was tough! I agree that it would feel more intuitive to dash in the direction you're moving instead of the mouse cursor, that's how these games normally work, and it felt like I had to kind of re-train my brain in order to fight the boss. That said, I will admit it made playing the boss fight feel different from most twin stick shooters, and once I got used to it, I didn't mind so much; moreso that the boss had so much health and I could only take two hits, haha. I eventually beat it and it was fun though!
I really liked the simple pixel art, nice color choices and everything read very well and was pleasant to look at. The game feel was great, and while a bit weird, the controls worked well once I got used to them. Seemed pretty on-theme in terms of the storyline. Had a lot of fun, fine work!