Hi! I gave your game a try, and I LOVE the idea behind it. I will definitely be forcing my friends to 1v1 me in your game. We love RNG duels like this, and I'm looking forward to the rising tension (Single player was cool but I totally agree that the local 1v1 is the core of your game).
If you get a chance, feel free to check out my game: https://itch.io/jam/gmtk-2019/rate/462268
It's a one-button rhythm game.