it will only work on the one screen, but you can choose which! when you launch the program, a small "SUGAR" window will appear with the engine's boot-up animation, you'll just have to drag this small window to the monitor where you want the UFO to reside, before the animation ends.
Viewing post in Notable Flying Typing Companion (NFTc) comments
this is the best collection of desktop pets and other companions that I know of: https://itch.io/c/733669/desktop-pets-virtual-companions
Next time I update NFTc I can make it so that it remembers what scale you were using the last time you used it. :)