Excellent Unique Game
Sanctum is one of the most unique indie games ever created. Most people who have tried it hold it in the same regard as Amnesia or Terraria. It blends the strategy of tower defense games, with a wide arsenal at your disposal, with the first person shooter aspects of Left 4 Dead or Team Fortress 2. It is designed in an anime style, so it generally feels light hearted and cartoony. The wave randomization, along with the customizable tower/weapon aspect, makes for a unique game experience every time.