It's polished, visually, but mechanically it could use some retooling. You move so slowly and the damage piles on so fast from enemies that I had a hard time killing more than a single enemy at once without losing most of my health. Also, brighten it up a little bit and add an upper limit to how fast the gun can fire. I can barely see where I'm going!
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I won't change the walking speed because I like it as it is.
About the enemy's damage: It's supposed to be a hard game, to frustrate the player, with permadeath, no medkits...
About the lighting: Yes, I agree it's maybe to dark, but I might not brighten it a lot, because to see the ghosts fading in from the darkness makes it spookier.
I tried to make an ammo system, but as I didn't have enough time and it wasn't working properly, I removed it. And it included fire rate, reloading...
And, about "how fast the gun can fire" it's a shotgun, so being able to shoot multiple times doesen't make a lot of sense.
However, thanks for the feedback!