Very interesting, thank you for making it and releasing it for free!
Do you get faster as you practice reading like that? I read ~50-60 pages per hour in English. That would be maybe 375-425 words per minute and also seems to be about the maximum I can more or less follow with ReadKinetic just trying the demo text.
Although, I don't feel like I understand quite as well what I have just read and it felt a bit aggravating? Almost anxiety inducing for some reason. Maybe it's just because it is a new thing and I'm not used to it.
Also, as others have mentioned, the controls took a bit of time to figure out.