Hmm...
It has a lot of potential, Funny sounds and what not. You should indeed try to improve the game with a costom mode, so people can play around a bit.
Also, aperantly I was able to get a score of 6862 by just stacking bricks into each other and then letting one brick fall onto the stack, it nearly cost me all my lives, but the score somehow stands that high, You might want to add something that prevents players from putting blocks in an area that's already "blocked".
Pun intended...
Great little time killer, keep it up