Alright, without spoilers, but you must promise to come back and discuss them with me after you play them.
The Bad Ending - stay with Mikko but ignore him. (I think you only need to ignore his invitation to go outside, but if you're going for a bad ending - might as well ignore him completely, this way the final scene seems more natural).
THE WORST ENDING - Agree to stay with Mikko, but bail on him when you find the key.
