Aurora Feint - How do I loose!!

[grfelix]

I download aurora feint, I was playing my firts game, then a box appears asking me to buy challenges or to continue mining (or something like that) and I choose continue... so now Im stuck in the game foreveerr!!!... when the cubes reach the top, a box appears saying that it's ok, and because it's my first game, it will eliminate some cubes for me ... so, I can't leave the game! I can't loose. I don't know how to win, when the first box appear (the one who asked me if I want to buy challenges or continue) was because I filled the bar that appears on the top.

What do I do to quit this level and advance on another one?