In a medium bowl, toss banana and 1 teaspoon lemon juice; fold in ricotta. In a microwave-safe bowl, melt fruit spread and remaining lemon juice on high power, 10 to 12 seconds. Add blueberries to fruit spread mixture; stir to coat. In each of four parfait or dessert dishes layer: 1 tablespoon wafer crumbs; 1/4 cup ricotta mixture; 2 tablespoons blueberries; repeat layers, ending with blueberries. Serve immediately or cover with plastic wrap and refrigerate to allow crumbs to soften, about one hour.