It started of great for me until I woke up to zombies attacking us!
I like how the controls are shown to the user in an unobtrusive way, that was a smart idea. The dialog scenes were well done, it's nice when I can skip past them, esp on the second playthrough. The art pack you used (and customised?) was great. The music fitted in well.
Only minor issuea were Dave, as you mentioned. When player is facing the camera the axe is still behind the player. When I click the dialog the axe moves. I didn't see Dave by the camp fire. All minor things, overall I liked it.