could we have a "no units" category, where you cant spawn a single unit in the game, so you have to win with turrets and special ability only.

this is possible i did it: as well as a friend of mine who also did it but didn't record anything i think this would be an interesting run

Need to rely a bit on rng, but its an interesting category! Who ever gets all turrets fastest, and gets best luck would have a good run.