So cycling through games right now
Bloons TD6, love me some good Tower Defense games.
Smite, It seems faster than other MOBAs and Arena mode is nice for something fast.
Dying Light, probably the best Zombie Playground out now but horrible story, it just edges out Borderlands 3 for best gameplay/worst story game.
Grim Dawn, Diablo 3's lack of character building beyond, get x loot just makes me glad this game is out. And with all the Masteries get so many combos to try out.
Heroes of Might and Magic 3 complete, an oldie but a Goldie one more turn game.
They are Billions, Age of Empires meets Zombie Apoc. I cannot speak for the campaign but the survival mode is too fun.