nice idea, darkinferno! I played it and it was fun!
Two thinks I meantioned:
Is the camera position at start of the level on a far point of the map? At start, the game needs some time and the Life of all towers are shown - so I thought maybe the camera could look in a direction, which does not include the whole level?
The second: Maybe you could create a kind of "radar", which shows the position of the remaining enemies?
Your idea is nice, I am excited, how your game will grow.

Just finished an other model nearly, a kind of mausoleum, the middle of the graveyard next to the start-village and the entrance to a dungeon: