This was cool, I think there's a lot of good ideas here!
My one note is the lack of variation in percussion. One constant snare march roll for 12 minutes got a bit stale... I think shortening the tracks by a few bars per section or varying up the percussion would help a lot! Even just breaking a bit and building back up. Varying them between songs would have helped solidify the separate worlds even further, too! Marching worked well for nature world but it would have been really cool to hear some more modern or futuristic percussion in the cyber version.
I think the way you weaved things together in the final track worked really well, and I'm guessing from listening and looking at your screenshots that you composed one final song and then broke it down and exported it as the two, which I think was really clever and certainly the final song works together BEAUTIFULLY, but I think the two individual songs could have been pushed even further apart from each other. Strong memorable melodies/motifs are all you needed I think to invoke the individual worlds, and you definitely have those!
Also thanking you for bothering to come up with a game concept, too many entries didn't do that 😭