I honestly don't get these opinions. They accept donations, they aren't charging you for services rendered. You are giving away your money in the hope that it will turn into a game. The reality is it's a passion project and passion comes and goes. A 3 month estimated update could take double or triple that and be completely normal. I get that we all love the game, it's probably top 3 I've played on this site, even the very small amount that's finished. But that's why I'm following the development, if anyones having a problem paying for a dream, paying for hope, they should cancel, but even paying at 1.5$ for years seems worth the risk to me. Nobody can complain about milking or slow development for something they've opted into, that's not criticism, it's just whining.
They don't need an excuse for anything since they don't work for us.
The problem is (and this is delving into a long debate on what patreon is used for vs what it's supposed to be used for) that game developers on patreon often treat it as payment for the game instead of a donation to support an artist.
Patreon is mean to be a way for a group of people to allow an artist (whatever form that art takes) to create effectively as a donation / support for their work in general. This is obvious if you know about the origin of the word patron with regards to artists. Rich people paid artists to work, and often work for them. The artist would be able to create their art, and the rich person would get fame and prestige for supporting said artist in addition to personal works specifically for them.
What has happened instead is people using patreon as a way directly gain access to a full project / artist's catalog. This is both due to how patreon is structured with rewards in addition to how people set up their patreon accounts. There's also the fact that it's hard for a general user of patreon to see if reporting a project does anything why a project fails to deliver. Note, even if you're not a supporter you can report them.
Last thing, as has been covered many MANY times, anyone is allowed to criticize, complain, and bitch about how a project (game, book, whatever) is being run / developed, and people love to bitch. Mostly you don't expect anything to change about it by complaining, but it feels good to complain and get the complaints out in some way. Paying for something is NOT a requirement to complain, and gate keeping who is allowed to talk about something negatively is really quite a bad path to take.
Now, I'm not trying to start or continue a flame war about patreon in general. And honestly I'm not sure why I decided to write this out (basically again, in this same thread).