Thanks for playing! Especially for such a long time :D
For the physics- I noticed unity behaves better, when the physics objects are of similar scale. Since my game has toy cars, and skyscrapers, it got wonky fast :) I feel your pain- for the big points you want to get that house early :)
As for the leaderboard- that's an oversight on my part. I had only 3 people to test the game, so the leaderboard never got very long. It downloads top 20 scores, and doesn't even display them :p
As for the scoring bug- I am totally aware it exists, but couldn't replicate it. It seems like the tower measuring component gets disabled, but I couldn't identify where it happens.