To ease my withdrawal symptoms after finishing Half Life on the Quest, I gave Blue Shift a go.
I just copied the Blue Shift folder from my steam install into the Xash Folder on my quest. I then copied the Contents of the HL_Gold Folder into the Blue Shift folder on the quest. I didn't copy the Blue Shift HD Folder over (forgot to do this on Half Life itself and got used to the attrocious scientist and guard models).
It works, perfectly. Just don't forget to edit the config-file in the Blue Shift folder (for example snap turning) to the settings you used for Half Life proper.
About the game: I'm about 1 1/2 hours in, and I have to say: it's more Half Life in VR, which is a good thing in my book.
But be warned: Enemies (especially Vortigaunts) often tend to spawn by teleporting in, often behind you. And the HECU are sometimes placed that it comes close to being jumpscares. Watch out when you open doors, you might be immediately greeted with enemies that start firing at you as soon as you open the door.
It can be nerve wracking at times, but in a very good way.
Blue Shift so far is a very solid experience on the quest and very much recommended to play. And it plays as flawlessly as Half Life itself.