Considering they said they are trying to make the leap to 1.0, I feel like it'll be a while. Of course I hope there will be some other updates, but that's what RalivDev said if my memory serves.
If thats true, then why have we not heard anything about that "other game". If there is no proof about it, then its obvious they only focusing on their main game only. (Plus it does not make sense for them to make a other game with no info about it or it not being on Itch.io)