We just upgraded the existing DLC to the Potatoman OST & Supporter Pack. In addition to the existing soundtrack, we also added wallpapers, artwork, miscellaneous Potatoman humor and tons of GIFs! You can find them all in the "Goodies" folder if you view your Local Files.
If you already own the DLC, it should have automatically updated. If you don't, it's 50% off this week:
https://store.steampowered.com/app/335170/Potatoman_OST__Supporter_Pack/
This expansion is in preparation for the the mega-bundle we are preparing to launch next week, called PIXELJAM COMPLETE, which will include every game we've made (over 20!) , some completed but unreleased games, every soundtrack, prototypes & alphas, concept art, design docs, gifs, wallpapers, etc... over 1800 files spanning our 14 years of making games.
Sign up for our mailing list at http://bit.ly/pixeljammail to be notified when it launches!. Or, follow us on Twitter for tons of bundle-related festivities: https://twitter.com/pixeljamgames.