Half Life ALyx as of now is a game that was build specifically for VR. And not just as 2 hour short minigame - it is a full 10+ hour AAA shooter game made for VR, compatible with ANY gen.2 VR headset optimised for ANY type of "VR playstyle" from direct movement to teleporting between points while sitting on a coach. It is literally Valve showing how AWESOME can VR game be if you actually put effort and resources in it instead of making another 15 minute minigame. This is also canon story continuation for HL series.
The files for the ingame screens are simple to replace so long as you rename the new file to the same name as the old one you replace so those scenes with hank hill and vtubers are ingame.
"Rise and shine, Mister Freeman - rise and... shine. Not that I wish... to imply that you have been sleeping on... the job. No one is more deserving of a rest, and all the effort in the world would have gone to waste until... well... let's just say your hour has... come again. The right man in the wrong place can make all the difference in the world. So, wake up, Mister Freeman... wake up and... smell the ashes."