Monster sound effects

[Cake for Mumm-Ra]

It seems like whenever there is an imp screaming, it comes out of both speakers equally. Same effect with headphones. Is this normal for this game? Usually sound effects help me place where the enemy is when they're not visible on screen.

Everything else in this game seems pretty on point, but enemies that are below me or in different rooms all sound just as if the were directly behind me.

speaking of sound effects, I'm sure I heard the 'door close' effect from the original Doom. I'm guessing there are a few more oldschool easter eggs buried in this game as well

[Am-I-Insane?]

There are acutally whole secret classic levels ingame, unlocked by pulling a lever hidden somewhere on most levels, so keep an eye out