As I said, I expected a full released game whatever you decide to do with it. I don't recall any detailed development roadmap and definitely not any mention of future paid DLC. I did raise an eyebrow at the number of DLC at the time, even though most were free, and that is part of why I got the Tungsten Edition even though I don't usually get non-flac soundtracks (the other part being "demo bonus"). It didn't promise future DLC but again I expected to get the full released game.
I purchased it in September, so it wasn't the full game for free then, although I actually purchased it before discovering the limitations (for the same reason I buy any game rather than pirating, I think it is good to support people making games that I like). I would love to see everything on the "bandcamp model" where you could play the game before purchasing. I thought you were doing something like that and it didn't occur to me that you might be doing a "free to play" kind of thing since GOG isn't supposed to be about that kind of thing. I played it a while for a couple of months and might have played a bit once this year. It is a decent game and I have recommended it a few times but I wouldn't call it one of my favorites. I've willingly paid for DLC on games with a bunch of content when they involve a substantial amount of work done after release and I avoid companies like Paradox that have endless trivial DLC even if I otherwise would enjoy the games. I just couldn't imagine that someone providing such an extensive demo would be one to nickle and dime anyone who paid for it.
Look at it from my perspective: you fully gave away most of what I paid for after I paid, then you want me to pay more for a small amount of extra content in a game that doesn't exactly have a ton of content to begin with, while at the same time you discount the base game 50% so that someone who hadn't previously purchased the game would pay the same amount for the base game + new DLC as just the base game cost when I purchased the game (the equivalent of the Tungsten Edition plus the new DLC was a bit more expensive than what I paid for the Tungsten Edition because the soundtrack wasn't on sale, but waiting to get the soundtrack the next time it was on sale would likely make that less expensive than what I paid). So on top of having a new paid DLC while still in early access you are asking me to pay more just for having purchased the game earlier in development. Please explain how this makes any kind of sense to you.