2 main things bother me,
First, the sound not sure if its a bug but at the web version the sounds on the right side are going to the left headphone and the left goes to the right (and when its in the middle it bugs just a bit)
second thing it takes just a bit to long to restart a level.
other then that loved the art style, loved the concept of the game and nice and easy puzzles, but I think it should be more "Bullet Hell" cuz now its more puzzly then close to a bullet hell type