Didn't really expect this game to get a major update for its 25th anniversary :0
I can see why it's highly praised by essentially everyone. It's fast-paced gameplay, rich atmosphere and intringuing lore make it all for a really fun experience, along with some well-structured level design and puzzles.
Though I gotta be honest, I didn't like the last few sections at Xen as the gameplay can be quite frustrating a good amount of the time, but outside of that it's a top tier first person shooter that aged very well!