There's a frog monster who eats the heroines to transform them into frog girls. The vore isn't directly shown, one image they're being pulled towards the frog woman by her tongue and the next they're in her (semi-transparent) belly.
I think tagging this game as vore was a bit of an exaggeration, but that's just how tagging rolls here. How many games I've seen with a mind control tag that have no actual mind control.