Not bad, could be improved.
Not a bad game, although there are a few things that could do with a bit of improvment.
-When you smash a building, half of the coins tend to fly straight through you, as you can't pick them up until they've hit the ground. Perhaps make it so that you can collect the coins during flight.
-When the people come running at you, you can't really splat them by jumping on them... they just kind of run into you while you're walking and they just... die.
-If you lose in the game, and you go to play again, the sound loop from the first time you played keeps on going, so you have two copies of the sound playing at once.
Aside from those few things, it's not going too badly, keep it up =)