A few things I liked, I felt you really nailed the atmosphere of the game, the music choice definitely helped, I also like your rewind mechanic, its very well done and I can see a lot of time was put into that.
Things I didn't like however, the lava jumps were much too difficult, not because of the lava itself but because the physics with wall jumping was rather poor, this was compounded by the fact that the you would run out of rewind way to quickly. Depending on how bad of a jump I did I would waste my entire rewind trying to get out of it. If you are going to give the player an ability, don't just take it away without giving the player either an explanation or a way to get it back without just dying. Aspect ratio for the menu was small so I couldn't see the full guy running at me and if you have a credit's page do it more justice than simply a skybox background.
Other than that I can tell a lot of work was put in and for a 1 week game you honestly should be proud of where you got in the end. Cheers to you going forward and I hope you have many good things ahead!
- Von Harley