I like it ! Inspired by the movie Tenet I assume ? The concept deserves more work to make it polished I think. The dithering thing was clever to comply with the limitation and it's nice, we don't see this kind of things often nowadays, congrats. About what I didn't like, I would say the controls should be mapped to the camera ( up goes up from camera point of view ), and the moving objects actions should be decoupled so it's more obvious that the bullets move before the hero.