I did a check for update and see 1.0 release now, fyi

GOG requires developers hand off patches to GOG staff before staff put it in the GOG installer and make them available for customers. It adds a delay, rarely more than a day. Sometimes the file is listed before being fully uploaded too, which I've seen multiple 1/5 reviews for. Just try again in an hour if that happens.

The full version seems to have been uploaded already. I downloaded the new linux backup installer (version RELEASE 1.0) and it is the full game. From what I gather it seems that either GOG or the devs have just forgotten to remove the early access card from the game's store page.

Confirmed. Just bought the game because of this info -> v1.0 is on GOG already! The store page has not been updated yet.

Best regards,
Raff

Does the game have any achievements on here? The store doesn't make any mention of it but the other day I noticed there was a "Popular achievements" section under the description with a single achievement icon but that disappeared now. The Steam version implemented it after 1.0.

Good news, achievements are implemented. I had no spare time for a session, but will check at the weekend. :)

Greetings from Germany,
Raff

Good to know. It's a bit odd that it's not listed on their store page. Hopefully, they'll update it soon, because those perks are quite a big deal for some, like myself.