Very cool visuals and music!
The concept is indeed interesting, I think a count of the total loops would be a good way to know your highscore, also some stats such as amount of enemies killed and what killed you in the end (something like killed by yourself from loop #5). A health indicator would also be nice (besides the vignette). Controls feels sharp and good, and it's very satisfying to shoot enemies.
The character models are well done and the game has a cool mood. Good job y'all!