This was a pretty fun experience! The sprites are pleasing and nicely animated, and the accompanying music matches the game's aesthetic well. It was also fun to discover all of the strange and random items dropped by the bunnies. I feel like having to manually pick up the items is a bit of an odd choice, considering that souls can be picked up just by moving into them, but it's not a big deal to me.
I only have two real criticisms that I can offer for this game. The camera swings around too dynamically as I move my cursor to aim and shoot, and it's a little hard on the eyes. Additionally, I felt like the game was much too easy, and I only started to find some challenge when the boss began using a wide spread shot that I had to weave in between.