I like the two player aspect, my girlfriend and I had a lot of fun playing this one :) This feels like Super Smash Bros with a teleport mechanic which is pretty cool. The bouncing bullets were also a clever mechanic and I hurt myself a lot lol.
My only suggestion involves the controls. I was on the ijkl controls, and I used my right hand, so I think I would've rather used U as a shoot mechanism so I could use my index finger.
Great job, thanks for sharing!