FELLOW KVLTIST Misskatonik
First of all, thanks for playing KVLT's Demo! also great nickname ;)
In regards of the possible soft lock, have you tried destroying the wall with the Enchanted Fire of the Shotgun? (it's the secondary fire with Right Click, by default). It's also pretty useful for killing Nazis!
In regards of music yes! we're working on a rework of audio in general, some of it will come as updates for the demo and some of them will just be for the full game sometime in the future!
If you have any feedback feel free to join our Discord and share it with us, thanks!