The video clip, which is relayed above, focuses on art director Kazuyuki Hoshino and the work he contributed to the game. Hoshino goes into a fair bit of artistic and philosophical detail behind both Metal Sonic and Amy Rose’s roles as characters, as well as the general design behind stages, boss machines, and Sonic himself.
If you’re an art student or fan art aficionado, this is well worth your time. Take a look.