I like how you establish one very clear mood, and work to build upon that with your composition. The little details in your right hand melody, be it grace notes or passing notes, are really nice. I wonder if you could also include such details in your left hand as well. It could be small things like rhythmic variations here and there, or little melodies in your left hand accompaniment when the right hand melody is taking a short break. For example I could see some great call and response things where the right hand plays something, and the left hand plays a short phrase back, being really nice in your piece. A great place for this would be in places like 1:14, where the right hand finishes a phrase and there's a short break, the left hand could echo back that phrase one octave lower to make your music sound more dynamic. It would also be thematic, since one hand could represent the miners, and the other the creatures of the biome. I think this would be a great video game track, kinda reminded me of Majora's Mask vibe-wise!