But that problem seems to have been solved, as one of the game's players has succeeded in playing Half-Life: Alyx without a VR headset using some simple commands. Discovered by Tyler McVicker

Run the HLA exe without steam installed, and it should boot up the game in debug mode (which is non-vr) then close the game, reinstall Steam & SteamVR, and make sure to tell steam where your game directories are stored :) Then launch SteamVR/Half Life Alyx as you normally would. And the game should work.

Half-Life Alyx, so far, is the top tier VR game if you exclude the simulators like MS Flight Sim and the like. Some of the other experiences and such are cool but they do border on being a gimmick. Sony seem to be aiming high with they talked up the Horizon VR title in the PSVR2 spec unveiling but the jury is out on that one until it releases.
Here’s the complete breakdown of all VR headsets which can play Half-Life: Alyx. HTC. Vive (original) Vive Pro; Vive Pro Eye; No, Half-Life: Alyx can only be played without VR controllers.
As you can see, Half-Life: Alyx needs some serious graphical muscle to run smoothly, especially on higher settings. According to Steam‘s May 2022 Hardware Survey, only around 26% of users on the platform have a GTX 1060 or better. So 3 out of 4 PC gamers need an upgrade to officially play Half-Life: Alyx based on minimum specs.
Without that your choices are PSMoveService (free but tricky to set up well), or Driver4VR. The PSMove controllers are not particularly well suited to HL:A, as they're missing the joystick/trackpad HL:A relies on for movement. NoloVR works well, but is expensive for what it is (unless you can buy used on eBay). 3.
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can you play half life alyx without vr