Unity is REALLY bad and unintuitive for 2D games. It's a 3D engine that begrudgingly lets you draw sprites except alpha and overdraw are really expensive. Basic

Unity is REALLY bad and unintuitive for 2D games. It's a 3D engine that begrudgingly lets you draw sprites except alpha and overdraw are really expensive. Basically any 2D engine will perform 1000x better out of the box.