The most adorable little robot in the world

This is my cute little R/C bristlebot. The concept and electronics are based on my first R/C 'bot, http://www.thingiverse.com/thing:12964/ This guy is much neater looking, though, and the circular shape is to allow it to spin when it bumps into obstacles. Bristlebots can't back up, so this is important.
The bot is surprisingly fast and exeedingly adorable. The circular shape didn't really work, though--I need to make the shell come down almost to the ground to keep the bristles from catchin