Very fun mechanic! It took me a couple of tries to understand exactly what to do, but once I got there it was great! Gameplay-wise I wish I had more blades to put on the brown wheels (though this may have been a bug in my playthrough). I also only saw different sized wheels once, and it would've been nice to utilize that more.
The slimes sometimes went through cogs, and while I don't think it was intentional I could just push them back by holding a cog and slamming them with it lol. Overall, I think with a bit of polishing this could be a very enjoyable game!