The last version came out three months ago...
The nature of the beast. You have to acquire somewhere...some patience. Gather a little knowledge, and temper your anxiety. The knowledge? That this is an independent developer, not a production company. This is a person, not a team. This is not a full time development company, this is one person with a day job, doing, if you ask me, a pretty damned good job with his work. You will not get updates of any length and/or quality if they're cranked out on a schedule. So yes, this game will take a little longer update to update. The dev keeps paying supporters posted regularly, and his reasons for delays are going to change from day to day, as is his working life, so the expectation in this case of a set schedule is, by the dev's own description, unrealistic. Lamenting ad nauseum how long it's taking from update is an anxiety that will not help anyone or anything. Particularly (since one can assume you are not a patron of his, your lament appearing here rather than on his Patreon page) your financial liability for his update schedule. I encourage you to just do something else. It will be out soon enough, and when it is, it will be, if the dev isn't rushed, worth the wait. Peace.