As someone who's struggled with depression before, I can relate to this, and it holds a really big meaning for me. If that's not the message you were going for, oh well. It's still what I got out of it. It's like you always have shadows haunting you, keeping you depressed. Pills helped for a while, but once I realized that it was my choice whether I was going to let life drag me down, I got off the pills and was able to be happy, and I ignored the little things that usually got me depressed. In the end the monster was me for not choosing to ignore the things that made me sad earlier on. I dwelled on the sad things and that was my downfall. I'm just glad I'm not one of the casualties that didn't realize that soon enough. I'm so damn glad that I figured it out soon enough that I didn't do something stupid like offing myself. At 19, I have a long life to live, and I don't need to waste it on being depressed.
Anyways, this animation just speaks to me on that alot, and it's pretty nice to see a story about someone overcoming their shadows too.