To be honnest when i saw the screenshots i wasn't sure how this would go, but it turned out that this was a good game actually ! You managed to give it a great atmosphere despite minimalists graphics, it feels like you are threatened by an overwhelming enemy that you still have to fight alone, and this is epic.
The only thing i would say is that the boss's attacks are too much unpredictable, you have not enough time to react, and i died a lot for that reason x)
Anyway that's a good work !!