RollerCoaster Tycoon (Any of them, you choose), Cities: Skylines, Grim Fandango, Portal 1&2 (Especially 2), To the Moon and The Stanley Parable (Better to pick those two on a sale, imo). Can't think of much else right now, sorry =P
Edit: Also, if you're into indie games, A Hat in Time and SuperHOT are two games I'm personally looking forward to playing, both are different styles too.