Its Mofuland. They sell games through several sites. The way they market them is in pieces as well. So they sell a game at its .x then sell it again at .y. You cannot upgrade. Or at least that is what they did with Cursed Princess where you bought the game each time a new version came out. They mostly monetize through their pixiv and dlsite though as they aren't an english developer.(Apologies for that - I was mainly being sarcastic there and tried to come across as such with the.)
Okay, so I got curious and looked at everything Mofu has - their fanbox, subscribestar, itch.io, even DLsite and you know what I found?
No one is paying for this game!
The fanbox says it's currently not accepting fans, the subscribestar only has a "free" tier with 130 subs, the itch.io download takes you directly to the download without a "pay what you want" option popping up, and the game isn't available on DLsite.
The mere thought that this game is some long-con scam of trickling out as little content as possible for months of money is complete bullshit. Updates are slow and minimal because Mofu is seemingly working on the game for absolutely fucking free. Will there be a paid option once the game is finally finished? I don't fuckin' know, I'm not the dev.
Edit: Also their pixiv fanbox says the next content update will be released 3/3 for those wondering.