I finished the game and I'm so confused, but other than that it was really good game! Actually made me jump and scream a little, the plot was good! And right from the start I called that Nester was the guy attacking people probably because of the music box scene that happened.
Thank you so much for playing the game and I'm glad that you enjoyed it! :) Yeah, the default ending is definitely set up to leave a lot of questions unanswered. Have you tried to get one of the other endings? Once you get on the path to the other endings, a lot of the unanswered stuff will start getting further fleshed out (hopefully eliminating any confusion from the default ending). Whether you do or not, though, I'm really appreciative of you playing the game!