Without a tutorial, this was kind of difficult to get into, but I certainly got somewhere! I assumed that pairing larger gears with smaller ones would give me more spin overall just like in real life, but I don't think that was happening. In the end I just focused on the combos of special gears and on getting placements to make sense where I could link the most gears without issues.
I didn't feel like I ever had enough money to really customize my build, not sure what I was doing wrong there. Also turns with a lot of gears took longer than they should have, as I was just clicking and waiting another 20 seconds for the same canned animations as last time.
Still, fun game. I love the unique gears. With a tutorial and better economy management, more options for the playing field, this could be a very addicting game.