I really like the style that you have implied for the overall design of the game. I feel like ballpoint pen serves well as an interesting medium for the design. Also I the animation of the characters are really smooth and satisfying to watch. But think you can make more improvements on the overall level design of the game. Some of the stages felt somewhat empty due to the numbers of enemies you face. I think it would have been better if there were more variety of enemy kinds(where they all have unique weaknesses and strengths). Overall nice work!