Retro City Rampage, the retro-styled open-world shooter and parody of series like Grand Theft Auto, was in development for Nintendo DS back in 2009.
Vblank Entertainment, the game's developer, posted videos of a working development demo to their Vine account. At some point, the project was scrapped, but the game did see a release on Nintendo's WiiWare for the Wii.
While a DS port never came to fruition, an improved port of the game was released as Retro City Rampage DX on the Nintendo 3DS eShop.