Fangames

Ones on Moriya work perfect.

Why is Bulma's eye on the side of her head?

because reasons

What constitutes a fangame over a romhack? That it uses a different engine?

does this mean the thousands of fanmade Doom levels are romhacks

basically

Brutal Mario/Super Kitiku World pretty much pars with a typical DooM .wad thanks to RNG editing in Lunar Magic

Good taste. The game recently added Grant as a character.

I wouldn't say that, exactly. A romhack constitutes changing the data in a rom image of a game. Doom mapping is pointing the engine to a new file, usually along with the complete original game file. Also, most people these days use a sourceport instead of the original engine, anyway.