Hello,
Thanks for having a look. I did plan to add actual models, textures and sound effects.
The idea was that it would be a 'protect the base' type game. The turret would be mounted on top of that base and would hold off the incoming attack long enough to give the people in the base time to escape.
If the enemy units reach the base they would unload a certain number of troops who would storm the base. The base defenses can hold off a certain number of troops, but if too many enemies reach the base, you are defeated.
More difficult enemies would fire at the turret in an attempt to destroy the it.
I do plan to continue working on it and perhaps I will post an update in the future.