Mighty Switch Force! 2 is out (and will hit the EU on 6/27), and that means another retro-tastic soundtrack is on the way, compliments of Jake Kaufman. Starting now, you can taste the OST on his Bandcamp page, and pay what you want for it. It has 21 tracks in total, including remixes.
Contributions will go towards equipment for more WayForward sound projects, and you can also get it for free, so it truly is "pay what you want" and doesn't require a minimum. Although I don't think it's as memorable as the soundtrack from the first game (this tune specifically comes to mind), it's still pretty awesome, and you can sample it for yourself for free.
Mighty Switch Force 2 OST [Bandcamp]