Well, if I understand correctly, the current rewind mechanics move your character's position back in time for a fixed few seconds, and then your clip is reloaded, when I first read about the reload mechanic in the tutorial, what I thought would happened was that you will keep getting re-winded until you are back to the location where you fire your first shot of the magazine, which I thought would create a pretty interesting movement system.
Which reminds me, the movement system would feels a lot better if its much fast pace, and maybe include something like double jump or wall jumping, the current system is fine, just a recommendation