My feedback is split into two parts because I believe that spreading awareness about depression is a good thing, but is not necessarily joined at the hip to this game or it'd design.
The game:
- I never really felt like things where getting better. Maybe portraying happiness as brighter lights or happy songs or happy objects appearing in the room. I felt like I was constantly overrun by the blocks the entire time. This could be a good representation of depression but not necessarily a good representation of overcoming it.
- Not entirely too sure how light (from a flashlight) plays a cohesive role in the theme.
The message:
- I think spreading awareness is a good thing, but maybe focus a little more on getting back to the good than being overrun by the bad.
It's tough to make a game with so much meaning so fast. I think you are on the right track! Keep it up!