Cool game! I liked the animation and overall premise of it. It was fun floating around with a bunch of ghost friends! The levels were all nicely designed and felt good. I like the small details you added rather then just putting in blank rooms. The variety of ghosts was great and I enjoyed the trail and error of figuring out which bullet effected which ghost.
I was somewhat confused in the beginning why some of them would just randomly leave me, but as soon as I realized why it all made sense.
If you wanted to improve, some sound effects could be really nice!
Overall, fantastic game!