

When you aquire bonus tiles some of them aren't fully readable
Works well
The game is rough around the edges, but the developers seem to care a lot about the game and keep it updated

Couldn't play online
New update, works much better, but there's room for improvement

No issues with Local game.
Crashed starting tutorial and joining a server. OK with local play (you vs AI).
Changing from fullscreen to windowed and back not fully working

Seems to be lacking sharpness
Launch options: PROTON_USE_WINED3D11=1 %command%
Tried on 4.11-13 and 5.0-5, did not start.

ln -s vcruntime140.dll vcruntime140_1.dll
Doesn't feel that sharp
Enabled log which reported:
err:module:import_dll Library VCRUNTIME140_1.dll (which is needed by L"Z:\home\user\.steam\steam\steamapps\common\Between Two Castles - Digital Edition\BetweenTwoCastles\Binaries\Win64\BetweenTwoCastles-Win64-Shipping.exe") not found
Then went to
~/.steam/steam/steamapps/compatdata/1158500/pfx/drive_c/windows/system32
and linked the normal version of the DLL to _1.dll:
ln -s vcruntime140.dll vcruntime140_1.dll

Game won't start
Installed via Steam and tried to run using Proton 5.0-5 and then Proton 4.11-13, both had the same result.

Never opened up
Ran through Proton, nothing ever showed
Windows friends needed to install Visual Studio, but I don't know if that's possible here. I havn't tried myself.