I like the simple pick on the theme but it feels unnecessary hard! :D
It's actually pretty hard because you're always toggling through the list of rock, paper, scissor. I think with speed/occurences text passes by at the moment it's better to have three buttons that set a certain state, e.g.: 1. rock, 2. paper, 3. scissors. Then you clearly define what as user's input is doing as a result.
Instead of making it hard to play I would simplify how the user interacts with it and instead increase the difficulty (amount/speed) things are passing by over time. Also make sure that at some speeds the text passing by becomes unreadable (too fast scrolling) and then it might be better to have more stuff happening at once.