Played the first level and the rest didnt unlock, is it because they're not part of the demo?
I'm not sure how to give feedback, I believe I'm understanding what the game is trying to do but I still feel like its missing something in the core gameplay, although I'm not sure what, maybe the combat felt a bit bland. For my gameplay I was mostly straffing in a circular motion around the enemies to avoid gettting hit and waiting for them to die