Enjoyed the idea of the gameplay but it definitely was a little buggy when backtracking.
Do enjoy the mix of 2D and 3D. Loved the sound fx of the streamers voice when you hit certain milestones. Really added a lot to the environment!
Auto targeting felt a little weird to me and the bullets moved kinda slow for my liking.
As others have said I like the idea of the health being tied to the Hype meter or something instead of just health... kinda like Ultrakill