Coffee Stain Studios' first-person tower defense/shooter hybrid is getting a sequel on May 15. As usual, pre-ordering nets you extra goodies, but in this case, you get something far better than an extra gun skin. Super Sanctum TD, which is also available separately for $4, is a retro re-imagining of Sanctum featuring traditional tower defense gameplay (with a dash of variety in the form of an active skill system). It features towers from both the first and second games, and a set of leaderboards to go with its levels, along with a large amount of achievements. Super Sanctum TD [Steam]