That's not how Patreon works. And that's not how any dev works. You give $ on Patreon to show support and tell them you like their stuff. That's it. Whatever they do with that $ is up to them. If you feel betrayed/milked/devs blow, stop pledging. Not trying to defend any dev with this, just pointing it out
Of course, it's an incomplete project, you never know where your money will go or if the game will ever be completed, that's always a risk. However, I only said there's an expectation, which is clearly stated on their Patreon that the money is being used to help the project.
I actually have no idea how development is going, if it was always this slow, I don't follow it, I am merely criticizing the idea that it's okay for them to be as slow as always after setting expectations that development would get more focus with more money.