Visually, Vexx looks great - but at the same time doesn't offer anything new. Colors are used really well and do an excellent job of conveying that particular level's mood. However, there are a few instances where the 'mood lighting' is a little too good, resulting in areas that are too dark, and hard to see in. I was particularly impressed by the sky effects, which showed neat transition between day and night. The individual character animations are very good, but I did notice a few minor drops in the frame rate. The texture work is nice and lends themselves well to the game's quirky character designs and levels.
The sound effects are generally good, even if they are a little sparse at times. Ambient sounds are present, but kept to a minimum at times and, just like Vexx's voice work, are kept straight and too the point. Even though the game doesn't waste time with fluff, what's here is good and blends well with the game. The soundtrack is good, although I personally found a few of the tracks a tad annoying.