It was a Poll fromFamitsu. They did it for fun (writers, editors) but obviously Sega listened to them:
1.)
Shining Force: The Legacy of great Intention
2.)
Landstalker: The Treasures of King Nole
3.)
Gunstar Heroes
4.)
MUSHA
5.)
Shining in the Darkness
5.)
Vampire Killer
7.)
Advanced Daisenryaku: Doitsu Dengeki Sakusen
7.)
Contra: The Hard Corps
7.)
Sonic the Hedgehog
7.)
Phantasy Star II
7.)
Yu Yu Hakusho: Makyo Toitsusen
Read more at
https://www.siliconera.com/2018/04/...wishlist-mega-drive-mini/#Z75lRPCZBDwOmHBk.99
Another poll of Japanese gamers in 2016 could give us clues:
10. Outrun - 45 votes
9. Altered Beast - 57 votes
8. Powerball - 75 votes
7. Landstalker - 84 votes
6. Ghosts 'n Goblins - 93 votes
5. Gunstar Heroes - 105 votes
4. Streets of Rage - 123 votes
3. Puyo Puyo - 168 votes
2. Shining Force: The Legacy of Great Intention - 201 votes
1. Sonic the Hedgehog - 371 votes
("Most memorable game")
In both polls, you can find already announced games for the mini (there are almost 1000 genesis games, Musha Aleste, Vampire Killer, Hard Corps, power ball cannot be blind luck)