The patreon system is not working, you just pay to keep the game in development, instead to pay for a released full game. They work hard until they get good income in patreon then they relax, start getting sick frequently, busy with real life problems, more time between updates, etc. The next update will have X and it will be awesome, you play the update and see that is not the work of 5-8 months of work and is not that awesome where they promised in their weekly/monthly patreon updates..
This is just a suspect until you see that they generate a good income and they dont grow, they dont hire anyone for the team to increase the game speed, because that will increase the speed of the development, if they do they hire 1 new to the team, but that changes nothing because the delay is the same or more personal needed and they can afford.
This happened too in the industry with the early access games that were years in this state before release.
Try to stop supporting this system and force to release a complete game, not milking the same during years.