I believe the initial intention was that it was going to be a live service game, where they would add more content and cosmetics over time and continue to support it, but after the backlash of their monetisation method (after people had already purchased the game) they got it to a 1.0 state and moved on to I’m guessing Monster Train 2.
It’s a shame because Inkbound had an interesting foundation there and I believe they could have figured out a better model to keep the game alive.
At this point I would think most people know, but for those who don’t:
https://xkcd.com/327