The sound effect on time change was a bit loud at least for me :D
Overall it was a relatively good game, I liked the idea of going back in time and things were different and you could continue, you had some good timing challenges as well where mid jump you had to change it. (I would have probably named it a dimension switch, just to even better go with the theme, but I got what you meant with it though!)
The game went back to level 1 after I played a few levels through, I think it has an endless loop or something?
Lot of the enemies were able to be just avoided completely with switching the time/dimension, I don't think I killed one enemy, a proper pacifist run I'd say :D So maybe cranking the difficulty with those could be one thing!
Overall nice game and good job on getting a game done and submitting, ain't always easy!