Good pattern, but far too repetetive
The main "loop" of chords and melodies overtop that continues throughout the song is pretty good and sets a strong mood, but the problem is just that - it loops. Way too much. While you've done a lot of variation in what happens overtop those main chords, the problem is that it lacks any real change or dynamics (in terms of volume, tempo, phrasing etc.) since it just sounds like more of the same for 5 minutes.
The beat was a nice touch, but again, something new should have been introduced along with it, rather than the beat just coming in on top of what we've already heard. While throwing a beat on top of a section of music that was just played is a popular musical tactic, it is by no means a good one and instead seems like just a way to gain mileage out of a song.
You've definitely got the compositional skill to make a great, more varied piece, so hopefully my criticism has been helpful! Keep it up and keep composing, symphonic music is the best!
-N
P.S. To all the commenters - while this is in the "Classical" category, it's not actually Classical music! It's symphonic, it's orchestral, no doubt, but Classical denotes a certain compositional style, and usually (but not always) certain time periods from which the music comes. This is more along the lines of a movie soundtrack, which is still by all means a good thing !