Thank you for playing! And thank you for the feedback!
Sorry the menu was confusing.. it was one of the last things I completed before the deadline.
I updated the how-to section in the game page, and the "Press x to Start" should be dynamically displaying the remaining choices for powerups and disruptors. It's no fun to have to read and understand a bunch of text before jumping into a shooting game, it will definitely be something I fix first!