Solid gameboy vibe and feel and genuinely did feel like some of the games from my childhood. Showing my age there :p
The rock, paper, scissors combat was a nice mechanic, a wee bit of animation to rotate the options when the different choices are made or something similar to highlight chosen option visually would be cool. The music was perfect for the game too, especially the tension building fight music.
I know you mentioned that you liked writing rather than programming and so I hope you've got some useful modules or feature components that you can take out of this game into future projects. Will follow and keep and eye on what you continue to build!
Good work on the submission!