I think there's a build of an older version of it on the YoYoGames archive. The archive didn't save the screenshots that the original website had, sadly.
I also spent a long time working on a very large update which I might have archived somewhere locally but never shared it online.
I was the creator of Tiagix OS, AFAIK one of the first subOSes that actually had support for creating apps for it.
Learned a lot about GUI toolkits making it, since I had to implement one from scratch for it.