Good game overall, I liked the art-style, good sound design, controls were responsive although the shift-arrow for fireball was a bit weird, and I ended up totally forgetting the dash and finishing the game without using it.
Biggest problem I found, was that the last boss is very exploitable. If you stand to his side, in a way to activate his side attack but just bellow enough not to get hit, there is an area were you can beat him by just walking slightly away when he fires the fireballs and then returning and spamming attack.
But good job overall.