I like the dramatic organ chords and thunder claps at the beginning. It’s pretty difficult to make out the string lines starting at :23 because the mix is so muddy. I know MuseScore doesn’t give you too many options for post-processing, but if you export each instrumental track into Soundtrap separately, you should be able to mix each instrument properly. Specifically, I would say you should use some equalizers to remove some of the lower frequencies in the melodic instruments, leaving more room for the low strings to shine through. In general, until you have access to more advanced mixing tools, it might help to give each instrument a “slot” in the frequency range that other instruments don’t impede on.
Compositionally, the piece is better. The somber woodwind line at :55 is nice, as is the string melody at 1:30. The texture might be a tad too busy by around 1:35 or so, though - I’m detecting some dissonances. I’d also recommend you create a bit more structural variety at some point by stripping away the frantic organ riffs and aim for contrast in the energy level and thickness of the texture over time. Right now, the piece has a near-constant level of intensity over the course of several minutes, which makes it hard to focus after a while. That said, the slow build-up in the organ and string riffs during the last 30 seconds or so was a great way of hitting the piece home.
I can tell you’re a talented composer. I just think you tried to do a bit too much with the harmonic layering here, and it’s also hard to make each instrumental part sound distinct and well-blended in MuseScore alone. Once you feel like you’ve got your arms around the mixing stuff, or if you have more questions, send me a PM and I’ll give you some more feedback. Keep at it, NinjaKing58! ^_^
Mixing, mastering, and balance
.25/2
Structure, transitions, phrasing, and variety
1/1.5
Melody, tonality, harmony, and texture
1.25/2
Instrumentation and sound design
1/1
Emotion, atmosphere, and catchiness
1/1.5
Originality and uniqueness
1/1
Overall (how do the elements above interact?)
.5/1
Composite score
6/10