

Works out of the box

Mostly playable
Gamma options don't work under Wayland. They work correclty under X11
Mouse didn't work until the sensitifity was set to it's max value
Fully workable under X11, but under Wayland it may have small issues. Mouse didn't work at all until I cranked it to the max, where it works as expected. Achievements are sometimes buggy. Played the full 14 hour campaign and finished it under X11.
Game is very enjoyable on the Deck with gyro controls. Battery usage is quite low, you can probably play for more than 5h.

works out of the box!
Worked out of the box

It's native, well, kinda...
The game works as native via Steam with no issues. For the ones who want to use the level editor based on the glorious Ken Silverman's Build engine, I suggest downloading the Win version of EDuke32 (which includes Mapster32, the level editor you need) and launch it via Wine 8. Follow the online docs for the configuration, as the whole game can be launched via Eduke32 too, especially for map testing. If you encounter some strange CPU/GPU thermal throttle like me (AMD) just install and configure CoreCTRL. It is very helpful to manage old programs that may overpower your hardware. You just have to create a Mapster32 profile inside Core Control and give it, on the GPU side, a specific "fixed" mode under "Performance Mode". For the CPU side, "Performance Scaling" you give "custom" and "Frequency Governor" you give "ondemand". That helps a lot with power consumption and thermal issues, CPU and GPU will not raise above 45C on full regime. Without this extra hardware tinkering, my temp went crazy like 65+ :/
Note: I recommend to use CPU Frequency Governor on-demand on the Main Profile also. The GPU side, it depends on your specific AMD model. Mostly, runs well on automatic performance mode, beside the fan curve (a must-do for better thermal situations).
Works out of box, native version.
Works fine
Every time it runs on my secondary monitor no matter what in game display settings are set. It can me moved with a hotkey
Native worked great, except it caused the KDE compositor to stop, introducing horrid screen tearing. Any proton solved this.

Works well
Perhaps it's just me, but i think its run faster than windows
Ion Fury supports hybrid input. Analog movement and mouseaim trackpad + gyro feels great.
Excellent out of the box experience, no issues.
There is an issue with this game people should know about. When playing there is NO SOUND from the headphone jack. However, unplugging the headphone jack directs sound to the speakers just fine. Not sure why, but since nobody reported it I though you should know.
No audio from headphones
Runs great native, and in steamplay. Tickles that 90s shooter nostalgia, and build games certainly have my heart.

Quick follow-up on my previous report - after a bit of searching, the proper solution is to add LD_PRELOAD="/usr/lib/libSDL2.so:/usr/lib32/libSDL2.so:$LD_PRELOAD" as a launch option, as the built-in SDL library for Ion Fury does not support SDL_VIDEODRIVER=wayland. No issues whatsoever.

Native runs perfectly fine in X11, but if you're using Wayland you will need to set SDL_VIDEODRIVER=x11 as a launch option if you have SDL_VIDEODRIVER=wayland set as a global environment variable, otherwise it refuses to run.