Hey there, Wayne Snee;
Yes, it absolutely has everything to do with your screen's aspect ratio... the game is optimized to run on 1920x1080, 16:9, any resolution above that (like 21:9) ends up cropped... making the "Start" button on the lower left of the screen inaccesible...
We are deeply sorry for the inconvenience.
Cheers,
Entalto Studios