Nice job! I had a great scare when I realized they were also coming from above! As others have mentioned, some tweaks to the graphics and the enemy behavior would go a long way, but it was fun! Thanks :)

Not bad to start. 

hmm interesting, I liked it :)

I guess to say I was confused is an understatement? The black walls are impossible to see, infinite ammo and no reloading is a weird system. The ghosts would pile up at walls and not find their way to you, and the health bar basically never went down, it was just 20 or dead. Maybe have rapid fire that does 1 damage each and you can see their health going down