Super Tux Kart... My childhood favorite! Now it might not be *too* complex, but it sure has some character in both the standard and modded stages! And the Music is amazing!!! It's also quite a novel concept, a racing game based on operating systems and general coding/modeling stuff. The addition of nitro to the standard "grab item hit enemy racer" gameplay loop doesn't do much to shake it up, but at least there's something more to do than aim and drive.
@MasterHellish-Gaming had a family pc when growing up and quite young, either has a boot of windows or i could dual boot it into linux, used to play allthe tux games aha and this hexagon turn based rpg thing.