I have to agree with a previous reveiwer, the clicking element is not good. i would suggest speed it up. maybe a system to select a primary target. not a great tower defence, got bored and the clicking system and overall speed of the game turned me off.

I get the idea of clicking, it is to keep the player busy. This gets very annoying after some levels. Instead, I suggest the following: let the player choose one, two or 3 "heroes" that he can put into towers, and whom he can tell to leave these towers and move to other towers. Result: the player is busy ordering these around, but without the annoying clicking. If I wanna click myself crazy, I play cookieclicker.

The game is playable and looks decent, so it gets one start for that.
Like most tower defense games there are different types of towers, however unlike most tower defense games you can choose to (must) click on a tower giving it the ability to crit and the more you click it the more likely it is to crit (-1 star for a bad system)
Also enemies have a chance of dropping bonus loot which you pick up by having to hover your mouse over, in addition any loot still on the ground at the end of a level (which is immediately after you kill the last enemy) does not automatically get added to your money, which sucks when the last few enemies drop loot, but you're *choosing* to click on your towers to crit, or to remove invulnerability (-1 star for a bad system)
Also like most tower defense games, enemies in this game have a way to ignore damage, however there is only one type of damage in this game, which leads to another (you guessed it) game of clicking on the enemies to remove their invulnerability. I mean seriously even a game about defending against balloons has different types of damage so that some enemies could be invulnerable to one type, and some could be invulnerable to another, not so that they could be completely immune to all damage. The only level in this game where I came close to losing was when the game spurted out all the invulnerable guys and it took me more time to make them vulnerable than for them to make it past the majority of my towers (3/4 the way of the map). (another -1 star for bad game design)
I fell asleep while playing this at points simply because it goes so slow, and there is no way to fast forward (-1 star for lack of entertainment), that was when i stopped playing the game, so this could potentially be batter later on (but i doubt it)

Muy bueno