First off, I had really nice time playing this little game. Thank you so much for making it.
+Pluses+
1. Great pixel art even down to the explosions, blood and death animations.
2. Adequate level design. There wasn't a level that I thought was bad.
3. Solid gameplay. I found nothing wrong with the overall core gameplay.
-Minuses-
1. Weapon sprites off center. The weapon sprites don't line up with the center crosshair.
2. Missing map overlay. Even though the engine supports a map overlay using the TAB key. There is no map overlay in this game.
3. Health allotment. I thought that some of the early levels had too little health while the later levels had too much.