It may have been a coincidence but I noticed most of my favorite games updates getting slower and slower, not just Summertime Saga. Bone's Tales: The Manor got its last update in November 2020 and it was a tiny one. I haven't seen updates for Mythic Manor for months. Harem Hotel got its latest update months ago and for some reason it wasn't posted here and I found it by chance elsewhere while looking for something else. Uni is slow as well but given that it is a one-man project, I shouldn't complain about it. Faerin's new game Mystwood Manor still in its infancy and for now too little lewd content. It also his/her attempt to make business simulation/tycoon game which is rare in porn games. Only Warlock and Boobs and Tales of Androgyny are regularly updated almost every month. ToA updates is so frequent that I couldn't catch up with it.
As for Summertime Saga, with its main story already concluded I hope the developer able to focus on other content. He started the project when he was a single guy today he is a father of three children, with the third one born earlier in this year. Because of that he got less and less time to work on the game.
Off-topic: Lost Eidolon, a turn-based strategy game inspired by Fire Emblem, only got about 40, 000 dollars in Kickstarter campaign with goal of 45, 000 which will end soon(as I typing this). Last month Darkcookie got nearly 70, 000 dollars in Patreon alone.