A really nice take on the theme; I like the idea of sort of controlling one body collaboratively with the AI.
As other people have noted, however, it feels like my part in the fight was pretty light; for the most part, the AI can do a pretty good job without me. I have to wonder if this might have worked better if it was the other way around, with the player doing the shooting and moving (I know I can move presently, but the AI just does it better) and the AI doing the time slows (based on number of bullets in vicinity or something) and targeting (maybe shooting the targeted one has a bonus?). I.e. giving the player the active role, rather than the support, passive-esque one.
Anyway, an interesting concept with a nice execution.