Steam allows you to buy the supporter pack DLC, but it's not available at GOG.
Supporter pack's description from Steam:

Yep, hope there'll be supporter pack on GOG as well.
also future mod support viable with nexus mod etc.

No demo either.

I like the 20% discount but I don't like that the potential Gog customers don't get equal treatment with Steam customers.

To note, this is a gog problem, not a dev problem.

Easy to confuse, but when you realize gog fails to procure stuff like this practically 9/10 releases, it's their fault, not the devs. The stealth releases, the missing dlcs on release, the missing soundtracks on release, the missing support packs on release, missing demos, and on, and on.

I'm sure it'll be here in a month or two after someone contacts the developer and asks why they didn't bother to list it, and they reply they had no idea they could. I would, but I'm sick and tired of contacting developers and asking if they can bring their stuff here to sell to me, and getting some weird response like I'm the jerk.

I'd say: It could appear. Maybe even for free. Happened quite a few times in the past. May take a Month or a few Month though.
Open a support ticket.

Are the 22 Graphic Units a reskin of already in game content or 22 new units entirely? Anyone know?? Thanks.

Hello. I spoke with the CEO of Goblinz. The supporter pack is coming soon with the exclusive skin =)

A month later and the supporter pack dlc is still missing.

These days it's normal that games are offered on different platforms (GOG, Steam, Epic). You shouldn't sell any dlc if you don't want to release it for all platforms.

You can also offer the dlc "22 new graphic units " free of charge for all customers, so you have only one version to care off.

Developers with such a release policy should not be supported.

Thanks for the info.

Uh, it's the difference of someone wanting to buy the game on gog or wanting to buy the game on steam?
Why would anyone that wants this stuff buy it on gog? We get that you're a simp non supporter vanilla game only kind of person, but some of us buy soundtracks, collect the art, among other things. You comment contributes nothing.

Fuck are you on about? I plainly answered someone's query, and that answer provided zero information about how I feel about this or any other game. My comment contributes a direct answer, without beating around speculative bushes like your reply to mine.

The supporter pack DLC is still missing.

Hello,

Thanks for the report, we've uploaded on the backend I will check why it's not available for the purchase, maybe I've missed something.

Thanks!
I would love to buy the Supporter Pack ^^