Though I have supported the dev once and quit because no progress happend, I have to say: a lot "background work" has been done since the last time I checked.
Things like full HD res, items, quests, female customers, interface things take a lot of time to create with not looking like much progress. Hope is that those things done now properly will make development faster in the future.
But yeah, agreed: it is very slow and its more likely that the dev will lose interest before it is even half finished.
He should have planned it better from the start (whats with the weird small resolutions (and no full screen) while we are moving on to 4k times, at least 1440p should be in there). Also why not start with a lot of sex action possibilites (three booths, more toys, more detailed animation, less mini game bullshit that takes ages to create) and then start to build the whole other shit around it?
I mean, no one will complain if they get some nice action first and afterwards there might be a story with some actual sense.
Instead he aimed for the big game which looks great but he probably never get to finish.