What games do you like which you think are similar to Half-Life? I've enjoyed playing Stalker and Bioshock and I am also interested in playing the Metro games. I have also played Stray which isn't an FPS but has a similar atmosphere with it's environments. The main reason I played it is because I like cats and have one of my own.
(Edited)
Borderlands, especially the first one has HL gameplay vibes - action, story and puzzles. It’s no surprise given it was by Gearbox.
I have heard good stuff about Borderlands and I can see why it's popular. But it doesn't really look like my thing but I am glad you enjoy it.
Timeshift is literally Half-life 2 without the aliens
That looks interesting, I really like your fanart btw.