Hi again, I found a few more things:
1) "Rainbow Islands: The Story of Bubble Bobble 2" [594] is a Master System game; the sequel "Rainbow Islands Extra" (which isn't on your list) is the Mega Drive entry for the series.
Segaretro
2) You have "San San" listed twice [632] & [900]
3) I didn't see Chavez II listed, was that a miss or on purpose due to it being a rebranding of Boxing Legends of the Ring [90]? Given some of your other inclusions you should probably include it (John Madden '93 [395] & Championship edition [917] as separate games, both versions of Klax [901 & 369], both versions of Marble Madness [408 & 902], Poyo Poyo [916] & Mean Bean Machine [195], and Super League 91 [725] & MLBPA Sports Talk Baseball [675] )
4) For "High School Soccer - Kunio Kun" [308], I couldn't find this exact title anywhere, is this the same as "Nekketsu Kouko Dodgeball Bu: Soccer Hen MD" ?
Segaretro
5) Another one with a mismatching title, "Mamono Hunter Yohko - Makai Kara no Tenkosei" [406].
Segaretro ,
Wiki
Also, regarding your comment for Outback Joey: "game that apparently can be played without the accessory"
is your list's qualification that a game must be playable without accessories (like a standard controller)? Because that's not the case for a few titles on your list (OBJ included)