Look around the hallways and see if there’s a key nearby!
Second ending is really a very very VERY optional ending, kind of like a "secret ending", so i'm not really interested in going so deep into it. you can totally get it before you even make dinner, so try to interact with everything that won't kill you! ((hint hint: if you've looked around the house enough, you should notice something with Henry's family. there's something in Henry's room that is definitely important to that story line, maybe after you check everything you should investigate))
what's strange about the music file is that it's fixed for me. I'm gonna try and reupload the game and hope it gets fixed, i'm so sorry about that!