I've played this game for more then 200 hours and there is still no end for me.
It's one of the best tower defense maps I've ever played and the 5 stars are well earned.
The Premium Edition was simply worth it, I love survival modes.
But in my opinion yellow, lime and orange is a bit to overpowered in traps there is just to much mana income if you use them right and they still deal such a damage cause of the critical damage.