This is really good! I think we both went for the same interpretation of the theme, you should check out my entry if you have time.
Your music composition skills could use some work, the piece you composed for the menu sounds a bit cliche. The one you made for the game sounds a bit better. If composition is something you want to specialize in, I'd recommend learning some music theory.
The art is simple but it works. Although, I think you should add a smooth transition between the 8 directions to make it look smoother.
For gameplay, switching between top down shooter and platformer feels really nice, but I wish I had more to do other than going around killing enemies to get a high score.
Maybe you could have added more screens and allowed the player to progress through them? You could really take this in any direction you want tbh.
I think this is a really good base for a larger game around this concept if you want to keep working on this.