Updated campaign mode, random rotation, and secret mode in Beta

Hey, everyone, If you've opted into the beta (which you can still do by right clicking on the game in Steam), then you'll see the near-final form of the campaign, plus some other goodies like a "Random Rotation" mode that chooses random game type, arena, and mutators for each match. There's also a secret mode hidden in the game :) The campaign includes a couple of new game modes--Gatekeeper and Stalwart that pit you against waves of enemies. In Gatekeeper, enemies don't attack you but try to go for exit tears. You must let no more than 3 escape in any wave. Stalwart sees your face off against waves or enemies that are coming for you. When any enemy kills you even once, his/her tear opens. You can't let even a single enemy escape. That's it for now. Enjoy! -Dan