Tonight, I checked out Cataclismo; sure enough, it was very much my shit. store.steampowered.com/app/1422440/...

Save 35% on Cataclismo on Steam

Design and build fortresses brick by brick to stand against endless hordes of Horrors in this real-time strategy game with resource management, siege defense, and exploration. Lead from the ramparts, ...

It's like an RTS tower defense game, but you build the fortress you are defending piece by piece out of LEGO-esque prefab blocks that stack together in specific ways. I spent an hour and a half on the 2nd tutorial trying to get my wall just perfect, only to realize it's much simpler than I thought.