Yum Yum Cookstar appears to have been made as some kind of contingency over Cooking Mama: Cookstar's legal disputes, being made by the same developers and publishers and having gone on sale on Steam a mere week before Cooking Mama: Cookstar was withdrawn from sale. While it is not known to what extent Yum Yum Cookstar is based on Cooking Mama: Cookstar, it does have a substantial difference in gameplay, having a psuedo-rhythm element that does not exist in the latter game.

Some prints of the box art have a printed sticker noting the game's connection to Cooking Mama: Cookstar, in spite of the controversy. The official website, TikTok account, and trailers for Yum Yum Cookstar proclaim the game to be made by "the creators of the best-selling hitgame[sic] Cookstar" (without acknowledging the Cooking Mama series by name) and use the slogan "This ain't your mama's kitchen!". The veracity of the claim of the first Cookstar being a best-seller is not known as sales figures have not been released.

While the game was briefly released physically and through the Nintendo eShop on the Switch, the game was later made unavailable for purchase. The original rumor was that the game was using the Switch's hardware to mine cryptocurrency, but this was later discredited by the game's producers. It was revealed that the reason for the game's quick removal from sale was due to a lawsuit between the game's publisher, Planet Entertainment, and IP owners Office Create. The lawsuit claimed that Planet Entertainment's license to use the Cooking Mama IP expired the day before Cookstar's release.