Glad you liked it!
The sprites are all a bit rough, and the player sprites are just blocked out, really, but I'm glad they feel good and fluid as that was my goal!
I'm very happy you liked the music. I've not done digital music production before, so this was entirely new to me. Next time I'll have to see if I can compose something entirely original, and not borrow so heavily from Chopin. :P
I'm proud of the boss fight. :D He feels fun and interesting, and challenging in a good way. I'm happy with the feedback on him so far.
Glad I could provide a browser version! I'd not tested it that way at all, so I was pleasantly surprised when it worked right out of the box. :P