To be clear, it won't be exactly the same. The MC in LoI, ironically, doesn't have any powers that deal with imagination itself. I meant to expand on that in this episode but you know how that turned out. The idea is the this game's MC is able to change a character's perception of reality in small ways at first, i.e., he's able to control their imagination. The game will essentially be a puzzle game where the MC talks to the characters and figures out their pressure points. That's the basic idea.
Btw, to avoid the thread from going off-topic, from now on anyone who's interested in the spin-off can follow the thread here:
https://f95zone.to/threads/progress-report-thread-for-lord-of-imagination-loose-ends.77976/
Right now, I've only created a very basic outline for the game. A few characters don't even have a personality yet.