I like the very strong feel of the heartbeat in this, it gives it a good tension and a very strong beat to work with.
The baseline sounds funky which I really like!
I would have liked to hear more development after the ~0:57 second part with the piano, I think you had a really strong core and buildup that could have been resolved really strongly with all the instruments coming together (which would fit in the theme of the fight well).
Overall solid work, it would be nice to hear an expansion of this post-jam!