This was fun! I liked the difficulty level. It was hard enough that I had to retry two times, but then I got it! I would've definitely kept playing, if there were more levels :)
And those conveyor-belts look gorgeous! Nice work!
One mechanic I didn't really understand was the swing-wrench-action. It wasn't obvious, whether or not I needed to discard broken materials, to prevent machines from breaking, or if it was just for making the materials flow faster.