Great work on your music here! 7/8 is a great time signature to keep the song pushing forward. It always feels like we are getting robbed of a beat compared to 4/4. I think it was a smart choice for the feel of your song.
The boss theme works really well, and I especially like the moment at about 1:35 where the brass comes in and makes that cacophony for just a second. It provides a good contrast to the more stately sound of the orchestral opening. Well done!