

I can't control the main menu by directional pad ( + ) so disappointed.

No problems at all, installed and played just like on Windows
The game crashes if VSYNC is disabled. With VSYNC enabled it runs without issues.

Does not start
PROTON_USE_WINED3D=1 %command%
Tried latest vanilla Proton, GE 9.7-1, and as recommended by another user here 7.0-6. With or without PROTON_USE_WINED3D set. No window shows up and the Play button returns after 3 seconds. Disappointing.

I always use pronton experimental, didn't even try default version.

Need to go back to an older version, works on Proton 8.0-4 too but required launch option PROTON_USE_WINED3D=1 %command%. Crashes on first boot, fine with subsequent ones.

The controls work rather bad and I was unable to name my city with the on-screen keyboard. The game crashed after a few minutes and I was unable to restart it. I don't know how this game ever got the "verified" badge but it definetly shouldn't have.
Worked around it by running game in desktop mode, going to Options > Graphics > Play Windowed. Game then loaded successfully. However, tutorial text was off screen, forcing me to go back to full screen after loading.
Go to Pause menu −> Options − Set "Font Size" to 110
The game freezes on loading levels. In main menu go to Options −> Graphics −> Check "Play Windowed"
When you click "Quit" from the pause menu, the game freezes and may crash Steam UI. Saving progress manually and exitting via "Steam button −> Exit game" works fine.
First start crashed after splash screen of Unity, this was the only issue I had. After that I can play.
Changed some of the ABXY buttons

Loading a saved game often fails.
If a saved game fails to load, the game must be force closed. After this, it will no longer load to the menu, and will not be playable again until the "delete proton files" option is used. At the end of the play session, the game fails to quit, and must again be force closed. Then this whole cycle starts over again.
Game crashed when waking machine from screensaver mode.
Game would not start until system was rebooted after its installation when using default Proton. Achievements would not unlock without switching to GE.
Experimental failed to start
It runs without any issues and with some customisation to the controller layout it's perfect on the steam deck.
Changed some buttons to the ones more used in the game.
The text in this game can be small so it han be hard to read due to this. Thankfully there aren't any walls of texts so it's okay.
Sometimes changes made in steam input wouldn't register properly. Also the alt button doesn't work for me.
There can be crashes but usually when loading levels or opening/closing the game.

With full screen enabled in option, levels won't load. Turning full screen off solve this issue.
Run like a native game
The game runs correctly, it is made in Unity, it is a pity that it does not have a native port, but with the default proton everything works perfectly