Really original concept and game overall! Love the art style even though I'm not sure if those are your own that you created on your time or open asset (either way, it is fine, I use open asset too). Well integrated and nice touch with the rendering setting to give it an 8 bit look.
That being said, my big problem with your game is that It's really hard to understand what you have to do. The jump between the two timeline was a bit hard to grasp, I even thought I was teleporting. Once I grasp it, I was confused about what the goal of the game is at that point. I walk around just so that out of a sudden the game is just you returning the time stone to win ?
Anyway, the concept is really cool, but need some work. Overall good job for your first jam :)