It is first shown when the player completes Floor 1 of the Devour Tower. The player can collect stars by finishing a breakout battle, with 1 - 5 stars are given depending on the scores you get. Stars can be used to collect Piñatas.
There is also a Premium Pass that can be purchased with 300 gems. The Premium Pass allows you to get Piñatas that give more seed packets than normal Piñatas.