This is really good, I could definitely see this in a film or video game. I really like the mixed 5/8 - 5/4 feel, and how you changed the rhythmic emphasis (3,2,3,2 vs, 3,3,2,2... etc.), it definitely created an "action-ey" feel.
A few thoughts:
I think it would sound better if it were a bit faster. I think of 120 bpm being a brisk walk, something like 150+ bpm would be a little more like a chase scene to me.
I think the orchestration and dynamics could be more varied, especially in the second half (after A on pg. 15). It seems like the glockenspiel and piccolo dominate this section, I'm kind of curious what it would sound like if there were omitted, at least up until the return of the first theme at m.78, pg.26.
Regarding the dynamics, maybe make the first part of the second section (starting at A) a little quieter on average, then build up to a higher dynamic at m.78. Right now pretty much everything in the second half is marked mf or above, this would give a little more dynamic variation like in the first half, and I think that would make m.78 a bigger moment (especially if the glockenspiel/piccolo return here too)
There are a couple spots, like m.9, where there seem to be two different rhythmic "feels" going on at the same time. Here the 1st violins seem to be breaking the measure down as 2,2,3,3, while the timpani is breaking it down as 3,3,2,2, I'm curious if this was intentional? It could have to do with the Musescore rendering, but it makes it sound like the strings and timpani don't agree...or maybe this is just me...
These are just some subjective thoughts, overall I think it's really good, and I like the inclusion of Soprano Saxes. I'm curious what made you decide to use Soprano instead of Alto? Perhaps to reinforce the upper register of the winds the Altos can't reach?
Thanks for sharing, I can't wait for more!