Here's a list of every 2D game released on the PS1 instead!
Pure 2D
Activision Classic Games
Adventures of Lomax, The
All-Star Slammin' D-Ball
Alundra
Arc the Lad Collection
Arcade Party Pak
Arcade's Greatest Hits: The Atari Collection
Arcade's Greatest Hits: The Atari Collection 2
Arcade's Greatest Hits: The Midway Collection
Arcade's Greatest Hits: Williams
Asteroids (classic mode)
Atari Anniversary Edition Redux
Baldies
Battle Hunter
Beyond the Beyond
Blades of Blood: Samurai Shodown III
Blazing Dragons
Bomberman Party Edition
Breath of Fire III
Breath of Fire IV
Brigandine: The Legend of Forsena
Bubble Bobble Also Featuring Rainbow Islands
Builder's Block
Bust-a-Move 2: Arcade Edition
Bust-a-Move 4
Bust-a-Move '99
Buster Bros. Collection
Castlevania Chronicles
Castlevania: Symphony of the Night
Centipede (classic mode)
Cleopatra's Fortune
Command & Conquer
Command & Conquer: Red Alert
Command & Conquer: Red Alert Retaliation
Crossroad Crisis
Dance Dance Revolution: Disney Mix
DarkStalkers
DarkStalkers 3: Jedah's Damnation
Digimon World 3
Discworld II: Mortality Bytes!
Discworld, Terry Pratchet's
Disney's Hercules
Dragon Tales: Dragon Seek
Final Fantasy Anthology
Final Fantasy Chronicles
Final Fantasy Origins
Final Fantasy Tactics
Gekioh: Shooting King
Gex
Grand Theft Auto
Grand Theft Auto 2
Grand Theft Auto Expansion Pack #1: London 1969
Guilty Gear
Heart of Darkness
Hello Kitty's Cube Frenzy
Herc's Adventures
In The Hunt
Intellivision Classic Games
Jigsaw Madness
JoJo's Bizarre Adventure
Kartia: The Word of Fate
King of Fighters '95, The
King of Fighters '99, The: Millenium Battle
Konami Arcade Classics
Legend of Mana
Lemmings & Oh No! More Lemmings
Loaded
Lode Runner: The Legend Returns
Lunar 2: Eternal Blue
Lunar: Silver Star Story Complete
Machine Hunter
Magic: The Gathering - Battlemage
Marvel Super Heroes
Marvel Super Heroes vs. Street Fighter
Marvel vs. Capcom
Master of Monsters: Disciples of Gaia
Mega Man 8
Mega Man X4
Mega Man X5
Mega Man X6
Metal Slug X
Mobile Light Force
Mortal Kombat 3
Mortal Kombat Mythologies: Sub-Zero
Mortal Kombat Trilogy
Mr. Driller
Ms. Pac-Man: Maze Madness (classic mode)
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