Tisiphone - you can use a character name again, just not immediately. It takes a little while for the system to catch up, so it could be a few hours, or a day or two.
Needs a more identifiable start button. Maybe have it just shoot constantly rather than require the mouse button to be held down constantly. Seems unnecessary.
Really great game, nice intuitive movement and unexpected turnouts. Could use some notification for what level you're on without having to return to the main menu.