Nice! These do sound... different to the original pieces - which isn't bad at all! They split the tune up across multiple parts for quieter and louder bits, when the original music would go full blast (which was partly what made it so memorable) One nasty side-effect is that there isn't much music in the LR music to actually begin with (it's amazing what they did with so little!) - so when you've split things up to be a little quieter, especially across multiple instruments, it can be a little empty. But the flip-side of that is that the music never feels too busy!
One thing the original music did quite nicely was mimic the flow of physical instruments with an accent and then decaying sound (especially noticeable in Knightmare-a-thon's timpanis) - and I feel you could have used that on occasion a little more. Though admittedly you mimic electronic (and as you say, more modern) instruments nicely not by doing that, and sometimes that really adds to the feel as well
Speaking of Knightmare-a-thon, loooooving the organ, piano, and heavy electronic bass there. That was a really good combo!
Maybe I'm a classical music purist, but I find standard drums (snare especially) a little obnoxiously loud and common in music overall. The music does such a good job of keeping the beat with the tune, the accompaniment to the tune, and the layering, and the bass - you don't need harsh drums to keep my erratic bobbing in time
I really like it, and if we knew how, would definitely be interested in a mod that replaced the music, this is really good! Different, and neither are superior, but good
(Might write a little more when I've finished listening to all of it )