As reiterated above, changing/adding sound, be it part of the soundtrack or dynamic, would make a huge difference. Vykkers Labs never felt scary to me, and it should. You just got abducted and violated by two scalpel-wielding sadomasochist octopoids, and far worse things are happening all around this place. You should feel like you're in constant danger of being caught and dragged back to the operating table.
I'd like to cite the medical levels of Quake 4 as a good example. Here, the strogg carried out some brutal, bloody, and generally fucked-up experiments on humans. The walls were caked with dried blood, you heard the distant, agonized screams of multiple victims and you could only imagine what horrors they were enduring. It felt like an animal testing lab, which was made all the more fucked up by the fact that the animals were your race.
Simply put, good sound design isn't that hard, but it can make or break the atmosphere. I think tweaking the sound design in Munch as a whole would make it about 50% better.
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