I wanted to be able to play most games made before 1990. I don't really like fighting games, I mostly like classic Atari games. I wanted to be able to play Asteroids with mostly the same layout of the original, and of course there had to be a spinner for Tempest.
After using the controls for a bit, I reallized I should have put the buttons at least another inch or so farther back, there's no place to rest your palm the way they are. It's still playable, but it could be better.
