I´m a fan of tower defense games, but I don´t see why this one ist rated so high. The lag is annoying and to hold the fast forward button instead of just switching speed is ridiculous. And i´m not willing to pay for better equipment in such a game.
@ bladezor: after the Bow of Lost souls you get the Necromancer´s Bow after beating Ergoth´s Throne. Then beat the Athena Pierce level to get the Ancient Amazon Bow and finally after beating Zakum you get the Bloodthirsty Bow. as far as I know, that´s the last one.