No, as far as I could tell, it all seemed to work fine. It wasn't a matter of bugs, and all of the other types of neurons and things are totally understandable based off the little bit of information given. It's really good. My questions and stuff fell more into "How many muscles can i attach to a neuron? If I have two limbs, should I have a neuron for each arm and the muscles there? Can I make something like a frog?" (I'm still working on that frog thing, but I might be overdoing the muscle system since this is obviously a lot more simplistic.) This is great and works well!