Ok, feedback:
Generally the game is fairly fun. The darkness was annoying for the first 5 or 6 runs but I'm getting used to it.
I do have criticism/critical feedback though. Firstly, it's far too easy to accidentally dash. Sometimes I stop moving to dodge a projectile or something then start moving again, and this restarted movement registers as a second press so I dash. I often accidentally dash into darkness or at an enemy. I think this needs work.
Secondly, why do items bounce you backwards when you pick them up? They haven't yet shoved me into an enemy but they've come close. I don't see any need.
Finally, the way you freeze for maybe half a second after picking up coins or gems is a bit irritating. It's just a niggle but I can't see any reason to freeze when you pick things up. There's a reason that hundreds of successful and popular games don't do that.
All in all, I think the game's coming along well. There's definitely still work to be done but it's promising.