Fangame is a related term of fanart.
In fandom|lang=en terms the difference between fangame and fanart
is that
fangame is (fandom) a video game created unofficially by fans of an existing game, and based on it while
fanart is (fandom) artwork created unofficially by fans of a book, film, etc, and based on it.
As nouns the difference between fangame and fanart
is that
fangame is (fandom) a video game created unofficially by fans of an existing game, and based on it while
fanart is (fandom) artwork created unofficially by fans of a book, film, etc, and based on it.