Nice entry! I love the minimalistic pixel art style, and the color palette was really well chosen. The gameplay is addictive and fun —I just missed the sound effects and background music.
A little suggestion if you plan to work on this entry after the jam ends, is to add some juice to it—some screen shakes on certain occasions, here and there, music, sound effects, etc.
Great job on the design and animation of the enemies and characters. Really nice work!