Great game. The controls were solid. The atmosphere reminded me of Super Metroid with hints of flash games like Endeavor. The style of narrative you chose isn't as unique as it once was; where a bodiless voice taunts you while you increasingly wonder who to trust. I thought it was interesting there were two voices and neither one of them seemed pleasant, so I chose not to take advice from either of them. I did take the halo once or twice because I really didn't know what it was but it helped me not die. I ultimately stopped when I realized it was like taking aid from one of the gods. I enjoyed the story and the ending I achieved.
I don't really have any suggestions. Great job.