That's a really cool use case for the library ! I think the calibration stage could be made easier with some "click as fast as you can on the randomly appearing

That's a really cool use case for the library ! I think the calibration stage could be made easier with some "click as fast as you can on the randomly appearing circle on screen" gamification, and just assume that people look at what they click on by default. It could be some little character changing color at random and you need to click it at that point, to make sure the user keeps his eyes on it for a few seconds before clicking.