The alternator direction switching is unintuitive, which matters for levels where timing is important. Currently, it switches direction before outputting the poo, sending the poo in the opposite direction of what is shown when you build it.
Broader feedback: having to constantly restart levels is annoying. If you forgot to put a piece in your machine, had an alternator flipped the wrong direction, or misplaced a piece of machinery (losing cash, since you aren't refunded when you delete things), you have to completely restart the level, building your machine all over again. The Zachtronics games are the gold standard here, having separate edit and run sequences so you aren't penalized for going back to fix mistakes.