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There are two resources to collect in Graveyard Shift: Zombie souls and experience points. Zombie souls must be collected with soul sucker tiles while experience points are dropped by zombies where they die, ala Geometry Wars.
Zombie souls are the currency used to place tiles and enchant them, while experience points help the player gain experience levels. Every time the player goes up an experience level she gets skill points with which she can upgrade her weapons and tile enchantments. Here's a video of the upgrade screens where the player spends skill points:
http://www.youtube.com/watch?v=PXKWKsNzhjo
Zombie souls are the currency used to place tiles and enchant them, while experience points help the player gain experience levels. Every time the player goes up an experience level she gets skill points with which she can upgrade her weapons and tile enchantments. Here's a video of the upgrade screens where the player spends skill points:
http://www.youtube.com/watch?v=PXKWKsNzhjo
