Technically, it is a fangame! So was Undertale (hence why it has enough similarities to make a game theory about Sans being Ness)! Got a problem with that?
Really though, please get back to me if you do have one.
Welp, seeing where we are here, I guess that means technically, Advanced Education is a fangame of Sonic's Schoolhouse! Wait, no. It's a fangame of evolution itself! But evolution was a fangame of science and probability...It all wraps back around to mathematics! Maybe you were a fangame of your...mother? Nevermind actually...don't take it personally, I mean you can all be decent people. But I'm just saying, since I'm guessing you didn't want to get back to me, so don't take this as accurate assumption.