I like the ideas for the cards affecting, but not overriding, the basic triangle to Rock, Paper, Scissors. I noticed the player and the opponent are given the exact same cards in the same order and that is a pretty important thing to change to simulate card game mechanics. It would be interesting if different characters had different decks later on in development.
I'm glad the starting difficulty was low enough for me to win against the first (and currently only available) opponent on the first try as the frustration of guessing incorrectly is an inherent danger to the concept.