A very intense and well put together game! The music and sfx are very well suited to the gameplay also. You really feel the damage being taken which is awesome.
Feedback for improvement: The pixel art is nice, although the walls and floor are the same colour, so could be slightly improved by shifting the colours to contrast them a little better. I like the tactical element between moving and shooting, although I think the gameplay could also be improved by allowing the player to move slowly while shooting.
This is a really great entry, and all the more impressive for being a solo one, and your first! Great job :D