Just played the game linked in your profile, love what you did with the soundtrack there!
My sister wrote the music in Ruby's Resolve using the built-in instruments in GarageBand. She has a very strong background in music theory / composition, but is newer to the production side of things. What she wrote here was awesome, I agree. I'll pass along your compliment.
Also I'm really glad you are enjoying the game so much! That's a really cool idea to add challenges to the runs. I suggest trying to beat the game in as few days as possible!