

Frequent stutter during late game bosses

After disconnecting and reconnecting to a bluetooth speaker, the audio played at 50% speed for some reason. Restarting the game fixed this.

Plays right ootb

Excellent Deck game all around
Ran great out of the box.

PROTON_USE_WINED3D=1 nvidia-offload %command%
When loading a save, the screen zooms so far in that the game is completely unusable, persisting even back to the main menu.
Sometimes crashes on launch, before reaching shader compilation. Fix is to restart the computer.
PROTON_USE_WINED3D=1 is to fix an unrelated bug involving NVIDIA Optimus and Vulkan

Game work perfect (I playing on DualShock 4)

Limit 7W
Ran flawlessly, no issues
gamemoderun %command%
gamemoderun
In the very hectic bullet-hell sections, expect framrate drops on the default graphics settings.
main menu uses more gpu compared to actual gameplay, mangohud reported 73% on main menu but only 42 when playing
Works fine
Works like native, out-of-the-box
Even replicate native bugs by lagging after 1 hour of playing. It is not due to Proton / emulation (but Vulkan API FYI), and it seems fixed by disabling all overlays, especially Steam one.
Works well on the deck, but supending the game might cause issues with sound
Worked out of box with controller support
Game would not launch out-of-the-box. After tinkering with drivers and launch options (WineD3D), it now runs fine.
PROTON_USE_WINED3D=1 %command%
Low FPS, improved by decreasing internal resolution and render quality
Perfectly playable after tinkering
Works out of the box, was able to complete the game without any trouble. The game slightly stutters on game overs, but that might be due to the game and not proton itself.
Works perfectly
Takes a bit longer to start than with windows, but the game does load with no issues and plays with no issues

D3D just "felt better" and fsync/esync made the game run at 30 fps at the fourth boss specifically.
Perfect out of the box
It's playable, but you really want to push high FPS to get a good experience on this one.
Game runs at just under 30 fps at settings which Windows can push to over 165.
Game itself runs perfectly apart from really minor bug at the main menu, which only happens when you haven't played yet.
At first there was some minor crackling at the main menu. But after starting a new game, it disappeared completely.

Install was typical, no special changes needed - just plugged in my Xbox One control (wired) and had no issues.
Minor frame drops, but still perfectly playable.