Newfound Courage will run on screen sizes smaller than the minimum supported resolution of 1920x1080 so long as the screen resolution is at least 1280x720 and the aspect ratio is either 16:9 or 16:10. 

The reason we do not officially support smaller resolutions is because at those resolutions, the game may not run as smoothly or be "Pixel Perfect". Also, the graphics could "jitter" but you'd be very unlikely to have any game breaking issues.