this is a quick workaround for people like me with the same issue
You can add command line arguments by running the game in a console like so (windows cmd)
nidaros.exe -screen-width 1920 -screen-height 1080
to play the game in a FullHD resolution
the game is not playable on an ultrawide monitor cause it zooms in and cuts of important parts, there are no options visible to change the resolution or fullscreen/windowed mode