The concept is nice, but there doesn't really seem to be any puzzle here. It's basically just "find the shortest path". Maybe the maximum length between the two shoelaces could be combined instead of separate. When one shoelace reaches max length, it has to pull the other shoelace back into the shoe to go further. There also needs to be some sort of other mechanic, maybe buttons that open doors, or pushable crates, or multiple things you need to cover with one shoelace to beat the level. As-is, there isn't really any substance here.