I really like this use of the theme, this is definitely among the top ten most unique in the jam. I wish I could've gotten a little further, but the implementation of the mechanic gets a little hectic after you make a handful of mistakes. I got to a point where I had way too many boxes moving around, so I tried to press R a few times and after like two or three times, I got a fatal error.
All that aside, there's a huge amount of potential in this. A lot of games have done something similar, but this is the only game I can remember that lets you control the timeline. I'd love to see you polish it up and make something awesome out of it.