I am already working on a second project~♫ It's just that I commissioned my artist for this project quite late so he's still playing catch-up~
As for when the second game will be out, I sadly tend to be rather slow due to only having one functional hand. And beyond occasional art and music commissions I work alone. The game page including the trailer should be up in a few weeks though~
That said my next game will feature characters from an existing franchise. So people may be turned off by that. Hints to the next game have existed in the first game's world and lore (among other things) since the first full release.