There's a "countdown" on the left. Each time you miss, where you don't clear any bubbles, you lose a green dot. When all green dots are gone, the bubbles drop and the green dots reload minus one. And so on until you don't get any green dots and once the bubbles go down after that, you reload back to the start again.
I'm sure this is a confusing explanation, but I think once you play again, you will see what I'm talking about.
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