For the retroGENmobile, you're right, the buttons are at a very steep angle.
I still have not received a working prototype so I can't tell you if it's a problem. At the same time, I don't see how we can fit six buttons horizontally without adding another three quarters of an inch. We could make the buttons smaller, but that's not a very good option.
Maybe we'll reduce the number of buttons to three? What do you guys think of that?