Positive: Awesome! Good looking pixel art, artstyle, animations. The varied enemies keep you on your toes. Simple but well done mechanics. Good use of the theme and diversifiers.
Negative/Feedback: Very repetitive music. It eventually got kinda annoying, so i'd recommend making or using a longer/more varied tracks or several songs. It would also be nice to have a toggle or volume slider for the music and sound effects.
Neutral: Quite difficult