Mighty Milky Way is DsiWare from the prolific studio of WayForward. Remember that digital era of miniature releases? As such, the cutesy puzzle platformer with gravitational pull systems can't be found in stores anymore. It also has the honor of being the last game to ever release on a Japanese Nintendo DS.
Secondly, the lost game had Jake Kaufman as a composer, known from Shovel Knight, Crypt of the Necrodancer and even Centipede: Infestation. Damn shame to lose bangers like these: