We are not able to release more than 3 monster girls right? I just happen to catch a extra mummy girl and now i have 4 of them in the castle will it cause any bug i dont have that room full yet in such a case is there a way to remove the extra monster girls(more than 3) from the soul lantern or the place and another question if i catch say 10 monster girl of same type from diff location and says farm can only have 3 what happens to the rest?

You can release more than 3 monster girls, but only up to 3 of each kind are visible. This is done to prevent the areas of the monstergirls getting too full.
It's not possible to release monster girls back into the wild after catching them.

Cool thanks for the reply ryen btw i love your game downloaded it this week already 20hours in you're awesome keep up the good work!!