Glimmer

This may just be me, but I liked the 'fall into a deep depression' part much more than the (Spoiler - click to show)'friend comes in and magically uplifts you out of your deep depression' part. Probably it's just me. But the ending seems incongruously upbeat when coupled with the very bleak beginning. I really enjoyed the beginning, though. Captures that process of withdrawing from the world.

It's a short game, so if you think you'd like it, I'd encourage you to play it yourself.