If you open the game in your library you'll see that the download button is blocked and the game is only available on windows.


To fix that we need to change Proton version to 6.3-8.

To do that go to game propeties -> Compatibility. Check "Force the use of a specific Steam Play compatibility tool" and choose Proton 6.3-8 from the list.


After that you can download the game as usual.

Another issue you might face after launching the game is that it renders only in top left corner of the screen.


To fix it go to handheld mode.
In game properties go to "Resolution", set it to 800x600 and check "Set resolution for internal and external display".


After that the game will be rendered properly.