In this level you MUST make the star bubbles pop the doom bubbles so that you can get at the first contact. To me it seems random if they do or not, I've played the level a number of times and only once managed to light up the first electric bubbles. If the star bubbles don't pop the right bubbles you can just as well give up right away, since I can't see a way to get rid of the unlit bubbles, even with the aimer. Is there a subtle trick with how to pop the star bubbles so that they pop the bubbles you want?