I think I might have created a perpetual motion machine using some blocks and a round object that wasn't moving at first. Now it keeps spinning and spinning without really losing speed.
Why don't you get bonus point for every placed item at the end? now you can max your points by waiting till things settle. In almost every case you'll come out with more points than when you just keep dumping objects in safe places without waiting for them to settle.
In little forest you should just place bob at the corner in the top left. Then place a mage at the second block from the start and a mage at the second block from the right at the second row. These are your primary units which you level to cripple and them max the specials. Place some warriors and energy heroes on the last row and level EVERYTHING to energy for max damage. These units are just to make sure you don't lose lives. Having them at lvl 3 with critical for warriors should be enough. Place one hero with a different element in the middle and see him rake in the experience from the last boss (600) + everything he gets in between.