Pretty cool game! As other people have said more feedback when you get hit would be nice, and I also feel like the telegraph for the charge attack in the second phase was really awkward - the boss repeating the animation made it really hard to judge at a glance how close he was to attacking. I also had a bug at one point where after dying and coming back there were still mines present from the previous attempt - only happened once though so I have no idea what caused it. As a whole this was awesome though, was a lot of fun!