That was really scary, I started it and one of the tiny things came at me like a bat out of hell, freaked me out something fierce
Still, after I got over that I had fun playing it, managed to survive for a while.
I only have two thoughts.
1. You could have varied up the monsters so you know how fast or strong they are based on images but its a game jam and the focus is on design so i'll ignore that
2. The multiplier should stay if you start hitting something, I had mine go down while I was trying to kill someone with a large health bar, that kinda annoyed me.
But yeah, I thought it was very well done for a game jam project :D