Had the same problem as the others on this, found the final boss quite difficult. I don't think the control scheme suited my hand very well, found using space bar to attack while moving and dashing quite uncomfortable.
I found I was taking damage a lot without really noticing (think adding a sound on taking damage might have solved that one).
The music was really crackily too, though I haven't seen any other comments saying that so that may just be me.
All in all a solid concept, but a few small changes would've really improved it for me. Nice work regardless!