Really good teaser demo but I suffered a lot during that boss fight because I went into that last room with very low health and the two medkits were not much help :/ It took me way too long to notice that you are not supposed to fight that one enemy so I wasted most of my ressources that way and I did not really feel like starting all over again tbh. So maybe you should at least heal players for the boss to make sure it won't end in frustration. Even knowing the pattern I felt it was really hard to survive with low health. Anyway this is some promising work and the atmosphere was great. It reminds me of Cry of Fear and I think I'll get the Founders Edition to support you.