Hey, I've just completed Day 30 on Regular difficulty, and I'm interested in what else the game has to offer but I'm not all that enthusiastic about purely extra difficulty levels. Is New Game Plus just a harder version of the 30 days, or is there extra characters, quests and locations to find?

The difficulty level is the same (and once again you can choose either classic or relaxed mode). New Game+ unlocks a couple new items and guests, and you can experience different outcomes if you make choices that differ from what you did in the first playthrough.