Thank you for taking the time to play my game! I appreciate the feedback! This was my first jam (and my first Unity game), and it was a really fun learning experience.
I agree that there should probably be some sort of prompt and/or event that teaches the player about the rewind mechanic. I'll have to look into an appropriate way to handle that.
As for the trying to get the final fragment... I had considered creating a visible path between the player and the last fragment to help guide them through the maze, but felt that it might have taken away some of the challenge. What are your thoughts on that?