I had an amazing dream a while ago and the images won't leave my mind. The entire dream provided me enough ideas to develop an entire game.
Just recreating the thing in my mind seem a little bit hard to do.
Here is the over view of the world. In each house is a different level:



This is what it is supposed to become:
right on the top: has to become a school. Here the game has to start with evil teachers. Students discover tunnel underground to escape the building (not visible here). they end up in some kind of indoor greek market. (the front in the middle)
to the right there is some 'wooden' house with somewhat like an indoor forest, in the middle there is a hole in it, and a waterlevel with mermaids (not visible here). on the back of the greek market there is a small walkable beach to a little wooden house. Player will be able to swim from the little wooden house to the shore (left above). With a bird they will be able to fly to the cathedral-like house, covered in fog. The giant windows are gone and covered by some wood. This is the mystery level with a lot of plateau's in it, starting from the top and trying to get down safely. When they exit the cathedral-like building the player can go to the bungalow covered in snow and ice. Here the game ends.

Can someone please give me some advise/help to get this graphics real good?