Cameron Waldrop
Here’s that video below before we get to a breakdown of the 60 titles available. The additional “(+1)” is unknown.

After Burner IIAlien SoldierAtomic RunnerBonanza Bros.ClayFighterCrusader of CentyDesert Strike: Return to the GulfEarthworm Jim 2Ecco the DolphinEcco: The Tides of TimeElemental MasterFatal Fury 2Final Fight CDGain GroundGolden Axe IIGranadaHellfireHerzog ZweiMidnight ResistanceNIGHT STRIKERNight TrapOutRunOutRunnersPhantasy Star IIPopulousRAINBOW ISLANDS -EXTRA-Ranger-XRistarRobo AlesteROLLING THUNDER 2Sewer SharkShadow Dancer: The Secret of ShinobiShining Force CDShining Force IIShining in the DarknessSILPHEEDSonic 3D: Flickies’ IslandSonic The Hedgehog CDSPLATTERHOUSE 2Streets of Rage 3Super Hang-OnSUPER STREET FIGHTER II THE NEW CHALLENGERSTHE NINJAWARRIORSThe OozeThe Revenge of ShinobiThunder Force IVToeJam & Earl in Panic on FunkotronTruxtonVectorMan 2ViewpointVirtua RacingWarsongYumemi Mystery Mansion

There are also several bonus games included with the Mega Drive Mini 2:

Devi & PiiFantasy ZoneSpace Harrier IISpatterStar MobileSuper LocomotiveVS Puyo Puyo SUN

Sega Announces Financial Results With Sales Growth YoY & Profit Decline; Expects Full Year Growth for Both Sega CEO Wants to Create Games that Represent Japan; Explains Strategy with “Super Game,” Worldwide Releases & More Sega Releases Yet Another Song From the Sonic Frontiers OST Sega Partners With Picturestart To Adapt Two Classic Video Games to Film Full Game List for Genesis Mini 2 Announced by Sega
Sega Mega Drive Mini 2 Announced For Europe   Full Game List Revealed - 9