This is pretty fantastic. I think the Facility and Train tracks are great examples of what a good job you've done here. That being said, sampled Electric Guitar is never really a good sound. The Dam track in particular would really benefit from live guitar. If that's something you're not able to do yourself, I could help you out. Also, the piano could use a bit of velocity tweaking. For example, in the Cradle track, particularly in the beginning, the piano sounds a bit lifeless. Obviously, this isn't dissimilar from how it sounded on the N64, but if you randomize the velocity (and maybe even the quantization) a bit, the track would have even more energy to it.
Great work overall!