Very good game
A very nice little tower defence game, though I managed to complete most of the achievements within the first battle. I think that there is certainly scope for this game to improve. Perhaps tooltips for when you mouse over a tower, to describe what sort of tower it is and the level, so then you can click on it and find what you need about upgrades etc.
I'd have suggested a better level system, where you get into the parts that need bigger and better towers, as the bugs are more powerful and perhaps a system where you can summon more bugs to fight against per wave, though perhaps that sounds like I'm taking a little too much from Gemcraft there.
With the way that you've got the game set up it is fantastic and the idea of Newgrounds Medals added to it would be brilliant. Keep up the good work.
[Review Request Club]