The dev, 1Thousand, has already made it explicitly clear that there will not be any sequels or prequels or otherwise once Deliverance wraps up. The story has been basically written up from day one. Hence, all the quality updates the project has been getting at its remarkable, consistent basis. See? It helps to have a roadmap instead of aimlessly shooting in the dark like too many (concept) projects found around here.
I just hope that 1Thousand will continue on with other projects for us to enjoy beyond Deliverance. One of the goals of the project was to see if there was enough of a financial interest for the dev to invest more of his real world time to devote himself into another project. For the dev, it's barely reached that threshold. (See his Patreon for details). And the fans have yet to hear whether or not he will decide to create a second project; though, it's implied that he's now considering it. If he does create another one, then it should be a more complex, better quality game. If 1Thousand ultimately decides not to, then all we can do is wish him the best of luck once Deliverance is completed. Personally, I hope he will continue with further projects, but in the meantime, I'll be looking forward to future chapters of Deliverance. ^^