It is a really cool take on the rewind theme. I really liked it.
I would improve it with:
-An indicator of when the wizard is going to shoot you (an animation or something). Also, it should have some kind of sound when it shoots.
-Wizard's projectile was too fast so you almost never can avoid it. I'd give some room to the player so he can dodge.
-Lots of times you get rewinded on a broken platform, id give the player the ability to restore that platforms in some kind of way. Lots of times i got rewinded to my direct death and it felt kinda bad.
-2nd level was SOOOO hard
-Checkpoints in some cases would have been nice.
-Some other people commented this too, sometimes the player doesn't jump and it should, feels kinda odd. And also, make it more... heavy, feels kind of floaty.
Overall, it is a great idea, interesting and fun to play, needs some polish but for a 1 week game it is really good! Congrats!