Unfortunately for us who like this game, their 'other' projects (both their own main games and the side work they accept from other Devs) take up too much of their time already and are also very successful being supported on Patreon/SubscribeStar, so there is little incentive to drop everything else and focus on this game. Believe me, I am just as frustrated and sometimes wish I had never discovered this hidden gem given the lack of support in updates. The silver lining however is they typically try to make up for it by releasing full 'chapters' of the story per release, only they seem to be putting out these releases semi-annually... iirc, we had only 2 updates last year so there's that.
I don't really consider custom/non-canon renders as reliable content to justify my support on Subscribe Star, but hey, that's on me for not learning my lesson.