The idea was nice, but the execution was terrible. The game is nothing but a lottery. No strategy involved, only luck - Basically, the "aim" of the game is to follow the script after starting a game:
1- Click "Evenly distribute all upgrades"
2- Click Attack! (which is weird for a tower "defense" game... which side are you on again)
3- Repeat 1-2 to exhaustion.
4- In case of a game over, restart and do the whole thing again.
This, obviously, shows how bad the game structure. Other than the original idea and the music (which I consider good, even though it is not "the last coke on the fridge"), there's nothing to praise here.
In fact, the medals are the only reason people play this, which in turn makes me wonder how come NG allows for medals on bad games? This allows for some "attention whoring" on the site, which I already saw before: Terrible games adding medals just to gain views and/or make people play for it other than original, creative or simply good contents.