You guys did a really great job on the graphic and music! The game build up a strong atmosphere from the start.
Collecting bullets and shooting enemies are nice. I like the idea of having the life represented by the distance of the souls. Yet I think the feedback of getting hit by the monster can be improved. Maybe adding a shaking with red screen can help, or bouncing the monster out a bit when hit so the monster don't feel like always move toward to you. The tutorial texts can be put with more spacing as to give user to digest and testing.
Overall, the game is very well-polished. It is enjoyable to play with.