I found this demo tonight which is a slight twist on the defence tower game. I've still not fully worked everything out but it's not bad for a 300 something MB download...
Sanctum is an Hybrid of FPS with Twer defense that was pointed out by the top chaps at Rock, Paper, Shotgun. A demo of the game
is now available, developed by Coffee Stain Studios and with plans to eventually create a full version of Sanctum based originally on the Unreal Tournament 3 and currently switched to the new Epic\'s free standalone Unreal Development Kit.Ref: Sanctum Demo Available
