Actually I just reinstalled it to check and it seems to pick up my deck input now using the latest Experimental proton and defaulting to the gamepad controller template. Was actually able to get ingame and play around for a bit.
Guessing I'll close this since it seems like it's working on deck, recommended retesting deck compatability rating.
proton experimentalx1 2022-12
Compatibility Report
System Information
I confirm:
Symptoms
Like Exceed 3rd, game doesn't seem to initialize the controls unless using 5,13-6. Apparently this was one of the 2 regressions introduced after said proton version, the first one being the black screen issue (which was fixed for all 3 games with the latest version of proton experimental.)
steam-207380.log
Reproduction
Start up the game, get past the launcher and notice the lack of control in the menu.