Holy this game is amazing. Its something I would pay for similarly to snkrx if expanded into a full fledged game. I'm going to be typing a lot so sorry for the really long block of text.
The music is really good. The fact that you've made it progress as you go through battles is a really nice touch and the only thing I can see that could possibly improve that aspect would be dynamically adding in the layers with something like fmod instead of restarting the song again.
The art style is great and really compliments the game. The amount of polish that's been put into this is phenomenal and I definitely noticed all the little touches to make it feel nicer to interact with.
In terms of mechanics its a really good take on the theme. You've got the elements of rng but with the rig mechanic you've given players a really nice way to control the rng in their favor. As well locking sides to prevent abusing the same tactic and forcing people to have strategies is a really good addition.
I really hope to see this expanded upon in the future into a full game