Movement and combat needs a bit more polishing. I found the movement to be very slow. Did you forget to add a 2D physics material to your player object? Because I kept getting stuck by the edges of a platform. 

Other than just shooting projectiles, I don't see combat being very engaging. Especially with the floating demons, as they seem really difficult to evade and/or take down.

Was their audio to your game? Because I couldn't hear it.