1) "On table" points shows how much you could add to your score
2) Every tile of floor must be on same level (with same weight) to be able score points
3) Color represents density
4) Enter button turns green then all of floor elements lined up peferctly
5) Every brick adds on table points equal it's count in wave and wave number. Eor example if it's wave 3 and second brick landed - it adds 2+3=5 points
6) That means you could continue to load your brick wall, it will give more points then new one but there is a risk you couldn't level it.