Ah so they are procedurally generated and I agree that it does make sense to cut the 'fluff' so to speak like decorations to get a working prototype up and running.
I very much understand the tension aspect you are describing, as I felt it quite a few times. I got a Siphon Edge which I LOVED using but I lost it :'( and the battles leading up to my demise were tense!
That's a fair point on the traps too and as noted above my tension level did rise! It was maybe the combination of them being invisible (unless you have focus on) + possibly a bit too much damage seeming a little bit on the harsh side but these things, especially difficulty and challenge, are hard to balance as you can never please everyone (maybe I'm too soft XD)
What you've noted about the battle bgm I can definitely understand and in actual fact, I did take notice of the music change much more with Remnant and Boss Encounters than I would have usually if it wasn't for the absence of music in mob battles. Just, you know, I like battle music XD
Again, though, great prototype and really had a good time playing it. I may revisit it once I get through some more entries/get some more time/finish fixing bugs with our game as it was a nice polished experience :D