The game itself is enjoyable, and has a very simple but effective design, which adds on to the nightmarish atmosphere. There is some serious potential here.
There are however some serious flaws, besides the almost complete lack of animations.
Mainly you should have included some bosses, in order to make the gameplay less repetitive.
Also an upgrade wich shortens the reload time would be most appreciated.
Some weapons, especially the shotgun, are basically useless thanks to their impossibly long reload time.
Even switching weapons seems to require time, giving enemies plenty of free hits.
Last, but not least, sometimes the infamous "wallbound" glitch shows up sometimes
I suggest you to make a sequel and correct those flaws. It would be front page material for sure!