I still think there is no appeal. Last week I had more than 12k visits in my Patreon, but this did not increase the number of collaborators at all.
I downloaded a game called Corruption, in it you're in a house with two girls (mother and sister, if I'm not mistaken) and you can drug them with a magic potion that corrupts them. Honestly, it's not my type of game, I do not really like this theme of corruption, etc., but I can see the appeal of that game. First, you visit the girls and you can do almost nothing. But after completing in-game tasks, you get access to bolder scenes.
I think Solvalley would have a similar appeal if from the first day you could walk freely around the school and try to talk to all the girls. At first they would not be interested, but by making events and completing some quests, the player would follow an evolution in the way the girls interacted with him.
In the end, the game would not change that much, it would only add some boring tasks, but apparently this is what the guys at Patreon want. They do not want a simple story with sex scenes. They want to feel rewarded for having won virtual girls. Of course, I can be completely wrong. But it is my impression in view of some games of quality similar to mine, which I honestly consider mediocre. Within this reasoning do not enter games with professional quality, like the Summertime Saga and similar.
I think it does not make any difference to leak the link at launch time, 24 hours later, or never. I believe that if the game has the right appeal, it will succeed even if it is pirated to hell.