RamBam V1.0.0.6
That went quickly.
While building the level, I first create the powerup stone and then I check whether it has 0 lives.
If so, then destroy it.
The explosion can be heard causing the music to freeze.
Also all power ups were the same.
Now when building a level I check whether the stone has 0 lives. If so, then immediately create the power up with a random value.