Game-breaking bugs fixed (hopefully)

It's been a week since the GMTK jam ended, so I finally get to update this. I was pretty proud of my submission ... until everyone playing reported that the game broke halfway through. The game relies heavily on recursion, and that typically means things can go horribly wrong in unexpected ways. Well, that should be resolved now. I also tweaked the level a bit to hopefully be less frustrating so you can focus more on solving the puzzle and less on not accidentally driving an inch too far. The puzzles themselves are unchanged, with the same solutions as before, so the walkthrough guide is still valid. If you still find problems, please let me know. And thanks everyone who played it so far!