Underground: The sounds you use are so intriguing. The machine-like whirring pad in the background gives the sense of being underground while the synth plucks/reverse plucks give it an almost space-like feel. The simplicity of the melody and instrumentation paired with the intricacy of the effects gives a really cool sound that paints a vivid picture of the underground world the main character has always been in.
Ruined City: The low pad sounds so cinematic! I love the flute and cello together - they work very well together to create the barren sound you effectively employ. The rhythmic pattern that comes in after about 1:23 adds a little energy and excitement to the track that makes me feel ready for an adventure! Then the drums at 2:34 add another layer that works so well! This song does a great job with vertical layering and would accompany this ruined urban wasteland very well.
Skyscraper: The rising arpeggios make me think of climbing upward. The brassy layer is very epic sounding! I really like the return of the “ruined” sound at 2:34- this makes your OST cohesive. This is a cool take on the “Wish Upon a Star” theme! Thank you for sharing!