This looks really nice, and it's a cute concept. The process of making the bulbs is interesting and complex enough to feel good. Not knowing which colour you'll make next added some interestingness as well.
The layout felt very inefficient (though I guess that was deliberate?), and by bulb 6 or so, it started feeling a little bit tedious. But maybe if there were different tasks other than just making lights, that could be avoided / mitigated?