Some random UI advice: If someone already owns an ability, I recommend replacing the "Buy" button with the "Owned" status rather than greying out the "Buy" button. Then it's more clear that there is nothing to do on the page.
This is fun as shit, but I didn't really understand if I was using the abilities correctly. I think it would help if it was really clear when I was using an ability, like an audio cue to let me know I used it right.