Perfect incorporation of the theme, soo good!! My freshman physics knowledge came in clutch haha. I didn't complete the entire game, but I think I played enough to get a good understanding of it (i completed like 4 output cogs). I really enjoyed the concept.
A few minor gripes (and one major one):
1. There's no audio. Audio would add a LOT to the game feel and polish. (this was the big one)
2. A main menu and more tutorials would be much appreciated. I'm sure there are a bunch of people who stopped playing after trying to know how to play the game and failing at it.
3. Maybe have middle mouse button camera pan? Left button sometimes drops a gear.