The primary reason we didn't add windows was that it might be distracting during the various dialogue scenes. There are moments when characters illude to what is outside, and it would be better to see it yourself, as a surprise. Part of why the scene when you step outside for the first time is so impactful, is that you don't know what to expect when you walk out the front door.
We actually made a point to have windows in other buildings for the opposite reason. Once you get to Tropos, the day and night cycle is introduced, so depending on when you enter a building, you get to look outside and be reminded what's there. Buccanary's shop in particular has a lot of visual elements for this reason.
It should be noted though... You only get to see two walls of Otus's house in the game. Who knows. Maybe there's a hidden window somewhere?
- Simon