

Everything works fine now on Proton Hotfix and Experimental. Proton 9 freezes at boot. Proton 8 doesn't provide leaderboards or cloud saves.

mangohud %command%
Using different save file from windows. I believe it uses a local save file (within the game folder) instead of the cloud save if it fails to connect to the steam network stuff.
No access to leaderboards. For some reason fails to connect to steam leaderboards.
Obviously mangohud is not required

Cannot access leaderboards in-game and achievements are not unlocked.
Works well on proton 8.0-x with controller and keyboard, but leaderboards do not show in-game (says "Not connected to Steam leaderboards"; not sure if bug or because my steam account is private), and achievements do not seem to get unlocked.
Crashes immediately on proton 9.0-x, experimental, and hotfix. Tried setting "PROTON_USE_WINED3D=1 %command%" for launch options, disabling Steam Overlay, and disabling Steam Input, but still can't get game to work on proton 9.0-x or later. See splash screen and then game crashes.

When using a higher version of proton(including 9.0 and experimental), the game freezes after the Vchiban logo and fills up my ram. Using Proton 8.0-5 everything works as expected.

Runs great on Proton 8.0-5 using controller or keyboard.
Game crashes immediately with Proton Hotfix, Experimental, and 9.0-4 (tried setting PROTON_USE_WINED3D=1, disabling Steam Overlay, and disabling Steam Input, but didn't help).