The Survival DLC adds the following to Tryst:

• New Game Mode (Survival) - Team up with a friend and hold your own against regular waves of enemies on the new map - The Construct.
• New Maps - Conquer two new maps: The Molten Passes and Obscurum. A 2v2 and a 3v3 map, respectively, they promote different styles of gameplay and come with their own set of quirks!