You're right. It did receive a small free DLC post launch. A new zone and the possibility to redo a harder version of the bosses too. A few new CGs too.Somebody correct me if I'm wrong but didn't Melty's Quest recieve post launch content?
In karryn's prison, I think the developers are cautious for many reasons like fear to overhype the game, the possibility of burn out either for sachinama or Rem or possibly both. They take care of their fans and they do not want to disappoint, that much seems self-evident from reading their progress report and discord channel.
With that said, my personal opinion, is that the game was designed with room to grow. For instance, the maps have places that could very easily fit into a DLC. Out of the top of my head, the infirmary, The store, the class, the pool and the ranch.
Also, nothing could stop them from expanding the prison (adding floors) if they wanted to.
I do hope they consider it, since I believe they have a solid base of a game and I would gladly pay for DLCs as this is one of the few Hentai games with actual game mechanics.
A personal fantasy of mine, would see them add side jobs and a collaboration with the circle kamichichi. They seem to have a close relationship with them and their art style would be a good match for Karryn's prison.
For all those reasons, I would encourage all of you to buy the game at launch as a show of support and helping the developers making new content.
now... 2 DAYS!!!!!