I'm perhaps a bit confused when you say 'the rewind function is essential to play the game' I dont think I used any rewind function, have I missed something? I played the two minigames, were there more? (I just want to make sure I didn't miss anything before I put a final rating).
I quite like the idea of the game, going back and helping a game-jammer do better; definitely something I can relate to/wish I could do :P
As others mentioned perhaps a bit more instruction as to what to do for each mini game would be better. Also, who says burgers and soda aren't healthy?! :P (just kidding, i need to work on my diet haha)