


The reason it doesn't work with Proton 9.0 is that the VR part has been rewritten and there are still some stuff lacking. So in further proton versions that might be solved. Also, the game hangs when leaving, in that case just stop it manually via the Steam Overlay or Steam client.

Using Index it does not honor the grip key but treats trigger as both grip and trigger
I think it is just the game and not because of proton.
On leaving a multiplayer game clicking "back to ship" the game crashed without error during loading.
Just change to 8.0-5. 9.0 and expiramental did NOT work at time of testing.
It works with the special build of Proton Experimental made by Paul Gofman, a Valve employee.
Controller always vibrates when you press the grip. This is discussed in the bug report by @gofman and it's unlikely that it will have a solution.
This is my second proton report now that the game is playable. Bug report on proton's github is here: https://github.com/ValveSoftware/Proton/issues/4946#issuecomment-878244774 -- as you can see in the bug report, Paul Gofman came up with a solution that makes the game playable and made his fixes available through a proton experimental build here: https://www.dropbox.com/s/lfnhf7466owwjr3/experimental-6.3-MR15-554-20210712-p1e0b6d-w0c53d20-ded3aac.tar.gz?dl=0 -- you unpack it to ~/.steam/root/compatibilitytools.d, restart steam and choose this version in the compatibility tab of the game properties. If you are reading this report months after it has been made, the fixes will probably already be in regular proton. When they do I will create a third report.
It works with the special build of Proton Experimental made by Paul Gofman, a Valve employee.
Besides the position of the controllers sometimes drifting, they would not stop vibrating, even with haptics turned off in-game.
This is my second proton report now that the game is playable. Bug report on proton's github is here: https://github.com/ValveSoftware/Proton/issues/4946#issuecomment-878244774 -- as you can see in the bug report, Paul Gofman came up with a solution that makes the game playable and made his fixes available through a proton experimental build here: https://www.dropbox.com/s/lfnhf7466owwjr3/experimental-6.3-MR15-554-20210712-p1e0b6d-w0c53d20-ded3aac.tar.gz?dl=0 -- you unpack it to ~/.steam/root/compatibilitytools.d, restart steam and choose this version in the compatibility tab of the game properties. If you are reading this report months after it has been made, the fixes will probably already be in regular proton. When they do I will create a third report.
As the controls do not work, the game is basically unplayable.
It seems the headset position was switched with the controllers position. The weapon and teleport beam would be right in front of the headset and the menus would also appear at its sides. Opened a bug report for that: https://github.com/ValveSoftware/Proton/issues/4946 -- however, the game is unplayable this way.