Good question!
Two main reasons. Just having beta #2 leak here has required me to answer a lot of questions regarding bugs I already knew about and that have been fixed. Even in a place such as my discord where a bug was mentioned and I claimed to have fixed it, there were still many repeated bug reports of the same bug by those who downloaded an outdated version and assumed these bugs havent been fixed yet. I don't mean to say I dislike these bug reports, the more the better. I just mean to say, when I'm being told there's a bug I fixed last week in your version multiple times, it can be a little bit annoying.
The second, and biggest reason, is I don't want people playing a terribly buggy version of the game. If they google Harem Hotel and they find Beta #X of v0.Y they'll download it, anyone would of course. Once they get a hold of it and find they can't play passed 10 minutes, they'll give up. That made that person think I make buggy builds. That person may never play Harem Hotel again because of one build that they weren't meant to play. A vast majority of people don't browse these forums, they just happen to find games to play.
Oh! That would indeed be the $20+ patron release of v0.4. Very few bugs in that version, however I am uploading a more polished version for $5+ patrons very soon. That version you're playing seems to be very stable. (Side note, if anybody knows the guy who posted this build over there, please tell him to update the pictures, haha)