I was going to make some sort of shmup tower defense thing where you place towers/options/multiples around the screen and try to avoid being killed by waves of enemies without having weapons on the player "ship" itself, but then I didn't feel like making waves of enemies and noticed that I had already basically made potential obstacles in making the towers.
The red bar draining at the top indicates when the next tower will spawn. When it empties, a new tower is placed at your current position. After another few seconds, the tower goes into "active" mode. Once active, the tower fires bullets at a set rate. Survive for as long as possible and set that high score!
Arrows - move
Shift - slow movement speed