Great game

This is a great tower defence game, I find myself replaying the levels all the time.
The only thing that would be nice is if you could sell some towers so the spaces could be used for better towers.
Also, some of the towers seem silly, like I never use the 3rd level freeze tower, because its not fast enough to slow down the creeps, the little bullet just trails behind the creeps until the 2nd level freeze tower slows them down enough.

alan taylor about Tower X