If you haven't played the game, why respond in the forums? They're very explicit about their plan to make 7 games in 7 genres.
The devs published a "what's next" on the dev blog at thingtrunk.com, which I'm not allowed to link to.
- Free patch updates to Book of Demons in 2019, including some new features.
- Book of Demons paid DLC, "more strategic mode", maybe 2019, maybe 2020.
- Book of Demons alternate prototype. This would be a reimagining of Book of Demons and could fairly be called Book of Demons 2. If they decide to go forward with it, maybe 2019, maybe never.
- Book of Aliens (second Book of the main series), "a few years away", probably 2021-2022.
- Book of Aliens definitely will feature multiplayer.
Post edited January 23, 2019 by thaumasiotes