Personally? this is where I try stuff. I like your game, I have no qualms paying for it, but that's assuming you finish it at some point. Here is the funny thing, games here get a lot of attraction, and its true, a lot of people don't pay for stuff. But there is a good portion that does, and I know people will pay a one time price for a completed game they KNOW is good. I definitely will and do.
A lot of devs make a mistake by milking projects instead of knowing when to tie it up and move on. I can't blame some, there is some "infinity" projects that are quite lucrative, where people happily pay huge amounts of money every month for something that never will finish. Those are exceptions though, if you're not already in that kind of mode, then its best to finish a game and you'll find a lot of people will buy it. Keep in mind, that if you hide content, you most likely stop getting more growth for your page so have to be happy with what you have, and also understand that the flip side is the game winds up here anyway.
edit: seems like your game is already profitable enough and you don't need to worry about what I said. I don't know what you're complaining about, "giving it away for free," and you're close to 8k on patreon alone, I didn't bother looking at subscribstar yet. I get they take a cut, but you're hardly struggling. I'm not saying people shouldn't pay you, but you're whining about free releases is really hurting your good will. I kinda don't want your game anymore just based on principle now. Don't worry, game is deleted, I won't bother playing this anymore. o/