The concept is interesting but the game has too much going on while I am trying to figure out the interface and rules.
I had a white request as my very first request and I couldn't figure out what color it was for a while until I realized it was white. I then piped all three colors into a single mixer and it produced magenta instead of white, so I had to redesign so that I had two separate mixers to combine the three colors, but I ran out of time.
On my second attempt I went a while with only requests for primary colors and I thought that I was doing fine, but then multiple floors started to make orders at once. I thought I addressed them all but it told me game over so there is probably some order that I didn't notice because it was offscreen.
Third attempt started me with a white order, followed by a cyan order, a white order on the second floor, a yellow + red hybrid order on the second floor, and then killed me from some order on the ground floor that I didn't see because I was too busy trying to place mixers all over on the second floor.
I don't know how to use the lift. I wish node and mixer were the same thing, so I could just always have multiple inputs and outputs for an arbitrary node, and even have multiple outputs for the primary color emitters. As far as I can tell, mixer is just a better version of node.