Dishonored 1 is a fun FPS single player game with magic abilities and interesting weapons and interesting story. it is a pretty linear game though.
Dark Souls is good if you haven't played it before. It has some multiplayer but mostly difficult, single-player PvM and bossfights, and you can play it offline if you really want to.
Bioshock is similar enough to Dishonored in the sense that it has weird/fun weapons and magic abilities along with a big story focus. Fun game
Portal 1 and 2 are classic first person puzzle platformers from valve.. chances are you've played them but if you haven't I would recommend it. If you dont like puzzle games dont go for it
Just Cause 2 is a nice open-world game with a lot of focus on weapons, vehicles and destruction. Nice game to screw around in but similar to GTA. Maybe Just Cause 3 is better or more up to date, but i haven't played it
the Crash remaster released on PC as you said, a year after the PS4 release, and i think they are going to do the same with the Spyro remaster which is releasing on PS4 later this year ;)