Dev has started working on a new game and he says that this time it won't be a party system based game and will feature only one main character (no more jumble jokers) and this time it will instead feature sub-characters. Now whether those sub characters will have H-anims hasn't been decided yet and he might provide an update on this soon.
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It seems like he is trying to increase the variety of enemies while limiting playable characters to one(Rats and Slimes are confirmed making a comeback). He says that if he tried to make another Jumble Jokers game and tried to improve upon the second game it could take him around 6 years to finish which he doesn't want.
tldr:
So basically he is gonna make a single character game this time, because making a third sequel with improved gameplay will take an absurd amount of time.
Here are some illustrations he shared for the new Main Girl Character:
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