Fun game! Paced very well, and I like the inclusion of a tutorial level. I also really like the camera and lighting around the player as it draws you in and make the whole game more suspenseful.
My only suggestion is maybe zoom the camera out a bit more as I found myself shooting at enemies that were off the screen quite frequently. However, I do like the inclusion of the indicators around the player as that greatly helps with this and conveys where the items and enemies are roughly located.
Great job! :)