I don't know what it is with me, but I love games that mix cartoony aesthetics with three-dimensional character models and environments. This game looks like what would happen if Game of Thrones was chewed up and spat out by the Sunday morning funnies. It's just as well; the bleak, medieval aesthetics and tone have kind of gotten old for me in the past few years, and it's refreshing to return to something lighthearted and totally committed to fun and laughter. Though you'll be participating in more than your share of death and destruction, CastleStorm's cheery graphical design will keep reminding you that it's not a serious affair.
The same is true of the audio design. This isn't a fantasy world populated by nothing but brooding, melancholic Byronic heroes. There isn't much voice acting, but what's here has all the bluster and pomp of Monty Python and the Holy Grail. This is completely consistent with the cartoony presentation and goes a long way in establishing a sense of identity for this already unique experience. The soundtrack is upbeat and vaguely militaristic, but it mostly just stays out of the way, for better or for worse.