I honestly really liked the game and the game style. The only off things for me were the:
Ccontrols, maybe the ability to bind keys or at least not have all the controls on one line on the keyboard would be nice.
Pause Menu: the fact that there isnt a pause menu or at least not one i could figure out how to get to? lol
Tutorial: Maybe having a small more interactive tutorial at the beginning showing you the basics and whats needed to be done in the game.
Overall though everything looks good!