On the first two, the typography is otherwise handsome but the dynamic background makes trying to read it a living hellscape for me (well, not that I could actually read Spanish).
One of the web accessibility standards I referred to above is that if there’s any automatic motion lasting more than 5 seconds, user control to stop it must be offered (if it exists alongside other content on the page, that is). I’m one of the people for whom that exists, for whom its absence makes something inaccessible. Like many ADHDers, if I’m trying to read something, motion on the screen is like being hit in the face with a frying pan. If it sounds weird that I’m expressing such a strong reaction to it, I assure you I find it just as weird that there’s anyone who can stand it.
If I were told repeatedly that one of those was the greatest game ever (and assuming I could read the language…) then maybe I’d go to the bother of modifying the CSS to play it, 'cause I’m a geek and I can. Many others wouldn’t perceive that as an option.
And this is one of the reasons I think it’s worthwhile to pay attention to accessibility: when you don’t, you gratuitously lose audience.