Bug fixing

A couple of bug fixes and game play tweaks here:

• When you cut overlapping ropes, you will now cut the rope you aren't on first instead of cutting both. If you want to then cut the rope you're on, you can just cut the same square again.
• In one of the last few levels, you could skip the level by getting on top of it. This has been fixed.
• In one of the forest level, some of the decoration was causing some confusion. It looked like you needed to exit the level through the top right, when you could actually leave anywhere along the right side. This has been adjusted to remove that confusion.