Hey man. Absolutely love your BMO games. It's an honor to have you around.
Look, the game is set at 720p because that's how I can develop the game without it lagging like crazy. I do have a potato, unfortunately.
You can try to press alt-enter to make it fullscreen, but it's still going to be 16:9.
I'll see about adding more resolutions. I'll figure out how to bring up that little window, when you start the game, to choose resolution and quality.