I see buying these releases as like the alternative to Patreon. I don't usually buy games in progress, and simply buy finished games here on itch.io so I don't have a Patreon. I guess buying the new releases each month for a comparable fee to a Patreon subscription is fair, since I could skip releases if a new batch of content isn't something I'm interested in.
That being said. I bought the previous release here, which was super hot. And then bought this release too, and it was worth it. If you're super patient, you could probably just wait till the final release and buy it once, then.
Back in the day, people bought game demo discs from stores to try out games before they released, so it seems like the same deal going on here, and seems fair to me.
I've played a lot of games that never got finished, but this one seems like it'll be finished one day. So, thanks dev for the regular progress! Take my money. :)