Dude!
When I usually listen to music, I just picture each instrument doing its own thing and I'll even admit that when I listen to other music with lyrics, I usually disregard the lyrics as words but an extra instrument and listen to the song as a whole (instrumentally.) If that makes any sense.
But um, when you said that this was reminescent of NIN, I immediately loved the song even more. I dunno, songs like this (a blend of guitar and ambience/piano) make me feel great and although this can be a song on is own, I also see it as an intro for something GREAT! This is great and now that you have your keyboard, I look forward to your future songs. You have just gone up two levels. Keep going man, you will go beyond.