Kirben: Shouldn't the GOG key be for the Deluxe edition? at least for people who bought the full original soundtrack too.
How was the Steam version handled in comparison? was only the Standard version provided too?
shmerl: I backed it without OST, so I can't say, and I don't use Steam. I bought the OST on Bandcamp anyway, since it's available there in FLAC.
Did you get a standard version on GOG even with soundtrack backing? It might depend on Terry Scott Taylor and Daniel Amos. OST distribution is authorized by them, not by Pencil Test. If OST is missing on GOG as a backer reward, try contacting Daniel Amos (but point it out to Pencil Test too just in case).
I backed the 'Animator's Scrap Heap + Deluxe documentary) tier through the pre-order options, offered briefly after the Kickstarter ended. Which should include the OST, but my GOG key is only for the standard version.
Unfortunately I'm unable to comment directly on the Kickstater page, since I pre-ordered.