From what i understood from the jam page you are kinda free to make almost any type of game. Strawberries are just fruit, soo just think about a game that you think would be cool to make and after that add the strawberries in some part of the core mechanics, that will add diferent outcomes, for example if you make a puzzle game about fitting pieces but the pieces are strawberry shaped it will change how you will make the levels, puzzle area etc.