Interesting game idea! I like the concept of the orb absorbing enemy fire. Unfortunately I was playing this on a keyboard which made it difficult to control the orb effectively. I think if I had a controller it would have handled a lot better (this is not the game's fault, just unfortunate circumstance).
I do agree with vimino that the light gray background clashes a bit with the game assets, but other than that, I enjoyed the minimalist design of the ship and enemies! Nice work!