Worked out of the box on Steam Deck.
WINEDLLOVERRIDES="d3d9=n" PROTON_USE_WINED3D=1 gamescope -f -W 5120 -H 1440 -- %command%
Thanks to user @mariano_ag and his input i found that the game ran perfectly with some minimal configuration, i.e.:
Installing Microsoft fonts. Found an easy guide to accomplish this here. The guide is for Fedora, but it will most likely be compatible to your package manager.
Note that you will have to enter the values for your screen size in the launch options. In my case it's 5120 x 1440 and worked great.
WINEDLLOVERRIDES="d3d9=n" PROTON_USE_WINED3D=1 gamescope -f -W 3440 -H 1440 -- %command%
This was a bit complicated, i guess because it's not made by a real engine (Not just Unreal, Unity or Godot. There are many good ones)
First to have the cursive font you need newer MS fonts, don't know the minimun i use ttf-ms-win11. But there is sometimes missing text, so i reverted to ttf-ms-fonts (Print font is also significantly more readable)
Then the garbled text had to fix it using both native d3d9 instead of builtin and WineD3D instead of VKD3D.
After that Fullscreen is smaller and not centered i "solved" that by running windowed with /NOF, but then i could solve it with gamescope setting width and height, also -f because i still had Gnome shell top bar.