Very nice, I finished all 23 levels.
It wasn't super clear to me that you're not supposed to get folders "crashing" against each other, I thought it was a bug at first, It could use some better indicator of why the solution you chose isn't working.
The normal execution speed could also be faster, I get that it's slow so you can clearly see the logic at work but it doesn't need to be that slow.
Of course it could do with more than just conveyor belts and logic gates, but you did a good job making content with what you had, it's a simple but fun game.