Dxvk with the fix has hit proton Experimental bleeding edge and can confirm it no longer crashes when you destroy the helicopter or loading new chapters from the load game menu, game should be ready to be tested for deck...
Update, if I try it with "DXVK_CONFIG="d3d9.textureMemory = 0" %command%", that seems to fix the crashing if I manually try to select a chapter, so it seems like a dxvk issue
I can confirm using Proton Experimental on my oled, as soon as I shoot down the helicopter with the rocket launcher, the game silently crashes a few seconds into the cutscene. Though after I booted it up again, and playe...
Sound seems mostly fine on steam deck. But when you fight the helicopter at the start, it seems to crash consistently, when you get the cutscene after defeating it.
Audio output seems to be functional as of Proton 3.15-5 beta. A bit glitchy, but very promising. Audio sometimes desyncs and becomes scratchy and distorted over time, the latter issue can be mitigated by placing PULSE_LA...
Sadly, there's too often log entries that look like problems but aren't - you can put anything into the log and even make nothing look like an error. It looks like this one is just something that may not have any bearing...