A really fun idea that's easy to wrap your head around. I'll mimic what some others have said with thinking some extra movement options would do this game a service, but also add that the bullet recall could be a little more generous; I often found myself near-missing the bullet while trying to catch it.
Still though, a good use of engine, concept, and minimalist design. There's a pretty strong, solid foundation to build off here, if you wanted to continue working on it.