Mm.....
As much as I love this game, it makes me want to snap my keyboard over my knee in frustration. Like some other people complained, some levels are just plain impossible. On top of that, I have to say, while I like the idea of ships getting left behind, it's a pain in the ass, some levels are just so difficult that you CANT beat it with one life, meaning that, while I may have ten max lives, they're all spread out at different levels, and I can't use them.
I'd like to see a sequel with some of the suggestions implemented; you'd have yourself another front page game for sure.