Nice beginner project for a game jam! Liked the experimental color scheme you use all throughout!
Sound effects and music would be nice to spice up the gameplay, many jammers overlook the importance of them. For sounds effects you can check various online sfx tools, for music, there are Creative Commons databases you can check and use!
The orange shuriken guys were a nice change with the reflectable projectiles! And and screen would have made the game a bit more complete!
Well done otherwise! Enjoyed jumping up and down.