This game is a clone of the VectorTD game David Scott. The aim is to stop the enemy from reaching the exit by placing towers/turrets on the maps. You lose a life every time an enemy reaches the exit. If the enemy reaches the exit, they begin again from the start.
There are 8 levels, each time you complete a level you get 3% interest on your current funds. You also get money for each enemy you destroy. This will allow you to buy better weapons to defend with.