Update: this game was cancelled in Japan, but released in USA as Harvest Moon: Frantic Farming!
Bakumono Characters Yasai De Pon! is a cancelled puzzle game that was developed by Marvelous for the DS. It featured many characters and locations of Harvest Moon: Island of Happiness, known in Japan as Kimi to Sodatsu Shima.
Nintendo Everything made a post with some info about BC in 2009:
U64 is an archive with articles, screens and videos for cancelled, beta & unseen videogames. Every change & cut creates a different gaming experience: we would like to save some documents about this evolution for curiosity, historic and artistic preservation.