With a Nintendo Switch Online + Expansion Pack membership, access a collection of SEGA Genesis™ games and more! SEGA Genesis – Nintendo Switch Online

Nintendo and Sega add new games periodically, often tied to themed updates (e.g., Golden Axe trilogy, Earthworm Jim ).

The Retro Revival: Sega Genesis Meets Nintendo Switch Online

So this is probably a repack of the official app, extracted as an NSP.

The hum grew into a roar. The lights in Elias's apartment flickered in sync with the console's internal fan, which was spinning so fast it sounded like a turbine. On the screen, the sprite reached its hand toward the edge of the display.