This was really fantastic! I'd love to see a mobile version of this game! Heck, I just want to see it developed past what it already is!
a) More tangible feedback on when the player character gets injured. It's really hard to tell; for the first 40 levels I thought I was a one-hit one-kill and wasted a lotta time trying to dodge (bloodier screen? there's too many bars to look at, so maybe a counter? [ ] [ ] [ ] and you lose a square each time you get hit, etc.
b) Maybe the level bar in the top left can fill up when you're gaining XP? Granted you don't want the HUD to distract the player from the main gameplay (it's VERY action-paced understandably, it's hard to tear my eyes away to see how many levels until I'm safe!).
c) Some customisation, i.e. choosing attacks versus survivability/dash length/speed. Or another character type? One that focuses on range or some other gameplay type (that said I really do prefer just squelching past the enemies! :P)
Overall, I really want to pay money for this game! You all deserve it :)