Hey!
it might be ideal to re-download the game
I ran it on the deck just now with
Allow Tearing off
TDP Limit off
Manual gpu clock set to 1500 mhz
The Game is running on proton 9.0-4
And the UMA Frame Buffer size is set to 4G
With that i passed the title screen , i talked to WarfStache and i was able to go on runs