Undertale - Underfell AU sprites

So basically…

Muffet wears different clothing
Mettaton is a broken multi-armed psycho
Alphys went mad
Napstablook is the Devil
Toriel went mad
Flowey got beaten up for being possibly the only one in the Underground who doesn't hate humans
Papyrus is no longer spaghetti, he is now angry-skeleton
Sans sweats for some reason
Monster Kid is a rebel
Undyne became a twisted psycho
Greater Dog is not nice
Asgore won't invite you for tea

Is this an AU where everyone but Flowey is evil?