Hello ! Very nice game, the art is magnificent but I've come across ONE major problem that could prevent people from playing your game. Here it is:
As you said, the engine should be on the bottom line of the ‘motherboard’. But you can be soft lock. In the first level, when you're doing the tutorial and connecting things, I moved the motor. It was no longer on the lower part. Then the game automatically zoomed out to the middle scene, ‘the brain’, and I ended up in soft lock, unable to do anything.