It's so great to be actually in the half life universe, I just play till the battery runds out on my oculus quest.
There is a more immersions feel to it than ever before which I know is stating the obvious, but it's true. Maybe when your head starts to hurt with the weight of the quest you lose some of the immersion.
Loving the gunplay system, reloading feels real, you are not just pressing a button. The puzzles look fantastic and are right on for me, not so hard that you get distracted too long from the game itself.
Graphics a great, I have a decent laptop running it onto my oculus quest, so it's much better than the standard oculus games.