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Play custom game, survival mode and see how many waves you can survive. I think the campaign is more of a tutorial thing and to have a mode with a sense of progression.

I felt this same way. Survival is the real challenge. Campaign is just for fun / learning the mechanics.

Schematics! Like in most industrial automation games the player is always the limiting factor.

Have you tried multiplayer? I think it would make optimization more important, as I agree in single player it's a bit too easy to cheat the system with sloppy production lines by just adding hella barricades and getting the best guns.