I played through Black Mesa the game after visiting the “crowbar collective” booth at pax east, and missing half life the first time around. Really loved it.

https://store.steampowered.com/app/362890/Black_Mesa/

My understanding is Black Mesa is a half life with modern graphics. So now original half life is updated…

And a complete overhaul of the "Xen" area, which was the weakest part of the original game.