I do really like this, conceptually, however I have two things from the actual WoG games this kinda misses. One is the fact that the building is really bouncy, but it wouldn't be as big of an issue without number two, nodes don't stick to the ground. This was decently important for the original, but a big chunk of puzzles in 2 would be effectively impossible without this. And, if you want, you could even implement a 'stick shear' where the stickiness would deactivate if a big enough force was applied in the opposite direction. Or, only some nodes/types of nodes are sticky.