the final weapon is terrible... I saved up for a long time for it just to find out that it is worthless. Lightning reloads faster and destroys 5x more than it.
http://i43.photobucket.com/albums/e400/highheat708/piratedefensewinner.jpg
this map beat the 101 without juggling or blocking the exits. It will beat it on hard, but it won't get you 175,000 points.
HOW TO EAT A BAT!
Pick a corner and use the tree limbs as the bases for your web, don't use the webs that you start with because they are too unstable. Then I only filled up about a third of the screen with webs in a really strong moon shaped design.
on the last level... right click once you get behind the boulder, then put your mouse over the little options menu that opens.
Its kinda cheating, but nice...