Cool take on the rock paper scissors concept. Nice visuals/audio.
But there's a strategy to win every battle with 0 risk that should be fixed.
Just block everything until the opponent uses a M/L attack. Then you know there will be an empty slot in the end.
Could be solved with 2 options. Let the ai/player insert blank slots, so you don't know when the 3 actions will happen. Or don't let the player use 4 blocks in a round, to always force you to expose yourself.
