Before new features were implemented it was time to solve all the existing bugs and avoid future trouble.
The issues in iOS 7 with Swift were finally solved. A SKNode layer was troublesome by capturing the touch events and the z-ordering was not respected. The downcast issue was also solved by avoiding the cast and work directly with SKNodes instead of SKSpriteNode. They were really a pain to debug, but with those solved I could focus in the gameplay.
Levers and bridges were implemented, as well as the valid movements for the monkey.