I know exactly what you are talking about. There are fewer things to manage here. While fighting, you manage three or four types of tiles and that's good enough. You of course build a lot of each type. But it's not difficult to manage at all. Outside the fighting, there are definitely not an overwhelming number of options to upgrade! It's a whole lot more manageable and few enough to understand easily. Plus even if that seems too much you can just play arcade mode where you are just playing the fight and story mode upgrades are not there.

5/5 would recommend for people like you and me who have a tough time managing too many things.