Hey guys, Karah here!

I have finished both the battle theme and the menu theme! It's, as mentioned, in the key of E major. I'm using a typical orchestra quartet for the instruments for the menu theme, and using a viola, cello, and timpani for the battle theme!
Initially, the themes sounded less upbeat, more stately, given the viola melody and the cello keeping the beat, but with the inclusion of the violin pizzicato in the menu theme and the timpani in the battle theme, it gave them the energy and feeling that they needed!

The pizzicato added the levity for it to be a more upbeat menu theme to match the aesthetic, using the second violin to add a harmony to the first violin's pizzicato.
For the battle theme, the timpani that crescendos throughout adds the feeling that one is actually battling. It was an interesting add, and not the first thing that would have come to mind, but it was an excellent idea from Nevin that ended up working well!

Now it's time to integrate it to the game and see what happens!