I think I actually know exactly what you’re looking for. Factoryidle (.com) is a “idle” game but is very involved and nuanced. As you progress you get small expansions to your factory floor space but the real boost in productivity comes from upgrades that make things more efficient. Each upgrade impacts different resources, thus changing your optimal ratios and forcing you to redesign the factory several times to be be optimal. I will say that a downside of this “build better not bigger” game philosophy is that it’s basically been solved as there are community made factory layouts that can’t be beaten