Hey man! Great work at coming this far. I can tell that this style of orchestration was stretching you, but I hope it opened your horizons and you’re growing a lot:)
Here are a couple of my thoughts:
Distortion: I also noticed the distortion over time. It was slight and in the background, but perceptible. I agree with both the above analyses that it’s part Musescore (which could be fixed with a DAW), and part a thicccc orchestration lol:)
Composition: This is already a great start. I don’t know if I would call it a “cue” (that seems to mean introduction to me), but it seems like a mid-scene Star Wars music. What I think would help you most would be developing your melody with a more cohesive theme (maybe using period or sentence forms), then using it to create a simpler piano sketch. Having everything sketched out on one (or two for complex pieces) pianos/organs/accordions helps to have a clear vision of how much harmony is going on at once. Then you can orchestrate and double all you want to get the timbre you’re looking for.
These are some of the most helpful videos I’ve found for this topic, from my favorite YouTube composer Ryan Leach:
This one covers using just a basic 4 or 5 part writing sketch, then adding octave doublings to give it an epic feel. I really recommend only using 4-5 parts/pitches at a time for emotional purity. This will also help cut down on the mud/distortion:
Next is an example of another young composer who was coached into writing a cinematic piece from a sketch.
Then finally, “How to Orchestrate…” is the pro composer’s version, starting from a more complex 2-piano sketch.
I hope that in giving high quality feedback, I might be able to receive high quality feedback when I post something:)