Fix which worked for me:
1. Go to your respective Graphics Control Panel and select 'Adjust Desktop Size and Position'.
2. Select the 'No Scaling' option and save.
3. Delete the GraphicsOptionsSave.xml file from the 'My Games' Offworld folder.
4. Shift click the 'Play' button on the launcher.
5. Select the 'Windowed' option and run the game.
6. In my experience once these steps are taken, fullscreen can be selected, resolution justified in game and the scaling set back to 'Aspect Ratio' on the control panel and my game still ran after a reset as if nothing happened. If you follow this step and the previous problems reappear, just re-follow Steps 1-5 and it should run like hot butter.
Enjoy the Game.