I just finished this game and I simply loved the suspense of not knowing who was killing everyone, and I even thought it might be another hidden character or something. Anyway, Nate looked very innocent.
Nate definitely reminded me of Geoff, maybe it's because I'm too obsessed with Geoff. Anyway, for my part, I didn't find any flaws in your game, only in the ending. It ends with a flashing red screen; I don't know if it's my phone or part of the game. Even so, I loved your game and all five chapters :]