The visual are nice, the third boss design looks really cool. The gameplay are nice, the shape changing mechanics is interesting, and I like how the boss get faster more difficult when their hp is low.
Tho the boss took a bit too long to beat, I feel like it would be better if the boss having less hp than the last one as the increase number of shapes to exchane already increased the difficulty and the time to beat the boss.
But still, cool game!