Pretty glitchy but still good.
Examples:
I glitched into a wall by dashing into it. I thought I was stuck but eventually I managed to dash out of it. In any case, you should include a reset button.
Returning to the hub area before engaging a boss will play the sequence from the last time to entered the hub, which is usually a boss-kill sequence.
You shouldn't be able to fight bosses you've already defeated.
When the dragon gets fast, i get stuck inside him and I'm able to do extra damage. Maybe that's intentional.
NG medals didn't work for me.