Combine blueberries, ¼ cup of water, orange juice, and sugar in a saucepan over medium heat; stir gently and bring to a boil.
Mix cornstarch and ¼ cup cold water together in a cup or small bowl; gently stir this mixture into blueberries so as not to mash the berries. Simmer gently until thick enough to coat the back of a metal spoon, 3 to 4 minutes. Remove from heat and stir in the almond extract and cinnamon. Thin sauce with water if it is too thick for your liking.
