Hmm.. This was a bit quite EH for me - but you have potential in some bits, let's start with the positives:
1) Multiple enemies was servicable, each with their unique identities and how they try to kill you. The AI was okay but I very quickly got tired of killing them and just ran past them only to realise they were no threat at all.
2) Your time slow mechanic was cool. But that's about it. It's a mechanic very reminiscent of Superhot but I don't think you utilised it well in your game.
Thematically, I don't see anything you can do with rewind. I either might have missed it but your tutorial did not say anything about rewinding at all. I don't think this was well made in that regard.
I think you should revisit the drawing board on this one. As far as anything goes, it's a first-person shooter, with shurikens instead, and a time slow mechanic. I felt like in order for this game to work, you needed a LOT of time, to fine-tune the AI and for good level design.
You should consider narrowing your focus in the next game, maybe only make 1 enemy and build your entire game around that, and your central core mechanic. In this game, your core mechanic would be the slow time. So think of something along those lines.
You can try and study Superhot for its game design.
Cheerios.