Very cool game! What you did well was you had a pretty good vertical slice of gameplay. There were no bugs that I saw, the game progressed fluidly, it was easy to understand and play. I enjoyed the music although the art was a little lacking. If I had one tip for the art it would be to look up and understand the concept of mixels in pixel art. The bad side to the game is that although it was pretty polished it wasn't very deep. There was only one type of enemy that I saw and the game. If you want the player to play for a long time, the game needs to change slightly over the course of the play time. Instead of just getting harder by adding more enemies, there could have been more enemy types, or collectables that you had to move to grab. These are just ideas, overall, great attempt!