Well I can't argue with people's opinions. If you actually like this and aren't simply in the sunk cost fallacy process then it's a simple matter of disagreeing.
While I'm disappointed that things are going slowly, at the moment, I honestly believe work will speed up once he gets the back-end cleaned up. Bad coding and what-not that was implemented early in the building process can seriously hinder future work.
It's kind of like painting a room. To paint a room, you have to remove items off of the wall, move furniture, cover the carpets with a drop cloth, mask off areas you don't want to paint over, get the ladder/brushes/rollers ready and get the paint open.
Sure, you could try painting the room without doing any of that but you've just made your work a lot harder by having to run outside and grab the brushes/rollers you need and you risk causing issues that could have been avoided, such as getting paint in the carpet, on the furniture, leaving bare spots behind pictures you didn't move, etc.
People don't seem to know or understand that SS was not planned to be as popular as it was. It was originally a tiny project designed to learn how to code and the engine it's currently on isn't just the Ren'py engine but a highly modified version of it with buggy and less-than-ideal coding. If he has any chance of turning this into a large scale game, he has to get that done first.
Those who are so impatient that they start insulting the man because he hasn't given them new fap material in a timely manner would best be served by just leaving the game for a year or so. They're not going to get that yet. Don't confuse this with me telling them to "Shut up and go away." as that's not what I'm saying. What I'm saying is that the game isn't, currently, in a position to receive huge content updates. The back-end system is priority right now.