Wow! What a neat concept! It took a bit of getting used to, but being able to summon a clone of myself to provide cover fire was a lot of fun! I couldn't really use the reverse time function that much due to the fact that I would mostly want to use it out of combat since I would lose control of the player, but by the time I'm out of combat it's been too long since I lost health so I wouldn't really gain much back. The clone mechanic is really great as is, but if I was able to summon multiple clones at once to potentially provide a ton of extra backup against a horde of enemies, that would feel incredible.
I feel like there should be a way to adjust the mouse sensitivity, it did feel a bit slow to rotate the camera around. I also feel like the enemies are a bit small which made it a bit hard to aim. Having that zoom feature did help a lot but I feel like making the enemies slightly bigger might help as well. Also if there was some kind of distinction between the player character, the enemies, and the clones, that would help to know I'm not wasting time shooting my fellow comrades.
This game felt great, I really enjoyed it! There's definitely so much more to be built off this concept and if you decide to keep building on this I wish you the best of luck!