I also want to praise the art!!
Like everyoen else I think a good tweak would be choosing weapons that lend themselves better to a rock paper scissor matchup visually and intuitively.
And then despite seeing how the theme is incorporated I also think it gets a bit lost because there is no real gameplaly difference between “you, the knight” switching weapons and you handing him a different weapon.
Awesome job for a first completed project, I really dig the stylistic choices. I think you could have leaned even harder into the cardboard-y thing and it would probably be even better as a small puppet play kind of thing which is the vibe i got