We've just put out a rather sizable update for the demo, this will be the last update it will receive until the full release, below is a list of things we addressed in the update:

.Added difficulty selection system
.Added new secret mini easter egg
.Added a slight hint to find the final number to the keypad code
.Drek AI has been massively improved and are now a lot more difficult, but rewarding on Normal difficulty
.Added Normal and Easy difficulty mode, Both changing the health and reaction to damage of the Dreks
.Text indicators now tell you if you have picked up the secret attachment for the Pistol
.Decreased performance hit when turning on generators
.Increased hit area of Axe
.Fixed a bug where pistol ammo would save across restarts
.Fixed Chase music bug
.Dreks no longer pass through wooden planks and instead attack and break them

That's all for now folks! Get in there, and smacks some Dreks!