I like this game. A lot! It's cute and I think there's quite a lot of creative energy gone into making it. The Cooldown problem has been mentioned by others. I just came across a problem with the Kraken caracter. His massive size hinders him from jumping from covered ledges. There is no other way to exit a level. I'd have to be killed at that point, but there are no monsters within reach. + Add an exit/abbandon level button please!
I like this game a lot!
However, I have one reservation/question about the damage based EXP system. Does damage dealt by Blaze and Poison Cloud add to the EXP gain of the towers that dealt the damage? If not then there is a problem with receiving less EXP overall for monsters damaged with Blaze/Poison. Maybe I'm playing the game wrong but this is a slight issue for me.
There's a glitch if you travel at full speed (x20) and the panels haven't reset to their old position after a battle. If you run into another Buccaneer party before the panels have reset you get to bypass them without battle.