Nice physics controls, and it's all very juicy! I like how it forces fast paced gameplay. But it's too hard and unforgiving for me. I encountered the big boss monster a few times, and then less than a second later I died. :-(
Maybe add health, no insta-death? Or maybe don't let the boss start immediately in full-bore-bullet-hell-lethal mode? Anyway I still liked it and it looks good. :-)