The brown character, Alfe, is naked for almost the entire time, but there's nothing explicit.
Violence & Gore
Mild
Cartoon violence is shown.
Profanity
Mild
Just occasional insults, which is formatted outside Adult Swim. The swearing occurred in the adult oriented pilots before the original series.
Alcohol, Drugs & Smoking
None
None
Frightening & Intense Scenes
Severe
Some of the character designs can be seen as creepy, with their bulging eyes and odd body shapes. Also, there are a lot of flashing bright colors commonly seen in the show. It is recommended that you take caution with watching if you have epilepsy, or that you are sensitive to bright lights.