Sheni was really interesting in the percussion department, I really love how it evolved over time and the sfx did an incredibly job immersing me into the world of the game. Pretty great stuff! I wish the melody was more ear-catching, as it didn't do much for me. But the percussion and sound design make up for it entirely. It's a really well made piece and one that feels very very sci-fi. Really good stuff.
REM - Great as well, the arpeggios and bass were really catchy, and held my attention a lot more. I found the organ to be a bit jarring, and can't say I'm a fan on it's inclusion. I also think it's melodically bland as well. But the first half of the song is super great.