We now have a playable version of our TD. It is not yet a game, but almost there. Towers can be placed, they shoot when they detect enemy within their range. The bullets can now collide with the enemy and their damage is done to the enemy’s health. When its health reaches 0 it dies and is removed. When the last enemy dies, the next wave spawnes after a short delay.

To do before it can be called a game: Win-condition and Lose-condition. And probably a cost to building towers. As it is now, one can fill the playfield with towers without waiting for cash to afford it.