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Sorry we overlooked this! Until an update's released that has better resolution-independent support, you can run the game using command line parameters to force a 16:9 (windowed?) aspect ratio.

(Whenever I do this for something I might use often, I make a shortcut to the executable and the command line parameters to the shortcut's properties.)

e.g. TerraNil.exe -screen-height 1920 -screen-width 1080