Nice creepy vibe! The lights and the ambient sound really adds a lot. I would have liked some audio effect when an enemy sees you so you know something is coming and it doesn't just comes out of the dark . Overall nice job :)
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Yes, I had it many times in my mind that the enemies should make some sounds, but... At times when there are 100 monsters next to you, playing a sound just once would feel weird, and allowing each of them to play a sound would just make your house explode. So, this was the design choice I ended up with. They only make sounds upon being hit or getting eliminated. I guess the silence can also add to the creep levels positively.