Sorry you don't like the model.
Updates were more regular until recently. We are getting closer to the end, so yes the updates are less regular but they have more content than before. Full release is expected this spring (on every platforms).
Please remember I work alone on this project, which I'm doing on my free time. I also have a full time job.
Again, I'm glad that you like the game enough to have wanted to support me. Just a little more patience, the game is almost finished and 0.20.0 will be available soon here. I'm working as fast as I can.