Fun little action game. Having the projectiles reflect was a good idea.
The 2D lighting is well-implemented, and the result is colorful and attractive. The darkness is not a significant obstacle to gameplay.
I really liked the enemies that hold up mirrors, and they look really creepy.
The game was a bit light on the soundscape. A bit of music would have gone a long way.
One last point: When combining pixel art assets, try to use a consistent resolution as much as possible. There is something jarring when the eye sees a combination of different resolutions.