I loved this. The levels were really challenging but not so much that I lost all patience. The walkthroughs are really helpful though I only needed to use the guide once, as the rest of the time I could figure it out after three or four attempts. I do hope that another version comes out with some additional things to do - I read somewhere that there was a build-a-cable-car level but maybe that's another version? It would be great to have some things to do that are apart from building the houses.
The graphics are excellent and the sound effects, too. One of the best games I have played!