I really wish one of the alternate games would take off, because I'm sure Alex would sperg out for days. We've seen how butthurt he gets about minor things, so I'm sure this could be even more entertaining. Plus, I won't lie, I think the yandere concept is fun.
Off the top of my head, I know of four projects. There are two tumblr projects that may or may not be dead. I wish them well but they struck me as kind of what you'd expect for a bunch of volunteers on tumblr:
http://lovemeofficial.tumblr.com/
https://takekumastudio.tumblr.com/
Yandere School is actually finished, so kudos to them, but it plays like a bargain bin version of the game. Without the whole community going on about it, no one really cared. But I'll link it again just in case it annoys Alex:
https://store.steampowered.com/app/687750/Yandere_School/
Finally, there's Crimson Gray, which I actually liked, but it's just a VN so I don't know if it's close enough to enrage Alex. But I thought it did a good job of playing with the yandere concept with some self-awareness:
https://store.steampowered.com/app/655770/Crimson_Gray/
Those are the ones I know of, anyway. I just wish they were popular enough to accelerate Alex's spiral toward self-destruction.