I really like this, especially the way you used the theme and how it informed the central mechanic. The vibe is nice; I like the simple art and music, and voice acting is always impressive to me for a game jam!
The one issue I had was that it was a bit confusing for me when first being dropped into it. When I first started playing, I didn't even understand that my moves were synced with those of the other character, and by the time I even figured that out, there were actual puzzle mechanics to learn (it took me really long to understand that you somehow put the key and amulet in the treasure chests with the arrow things, I think?).
That said, once I got into it, I couldn't quit playing, even though I kept losing anyway. It was quite fun to try to puzzle out once the mechanics started coming together for me.
Anyway, great work, and awesome use of the theme!