I'm a big fan of factory/automation games and I think you have a really interesting concept! As the other comments have said, I think it is too difficult too soon to start. If you just make it a more gradual increase in difficulty I think that would work. Like maybe give the player 8-10 different delivery requests before opening a new floor. Otherwise, though, I think the overall concept of the game is really nice and I enjoyed my time playing it :)
Also, how are you supposed to connect multiple delivery requests from one node? You can only connect the color node to one thing and that's it, but if there are multiple delivery requests that need a color, you are always just screwed. Maybe there is something that I am missing, but I lost basically every time to that.
Alsoalso, there is a bug where you can drag and place a node on top of a color node, removing it forever lmfao.