The software replaces several OS visual elements, including the Start menu, system tray, desktop icons, wallpaper, and even skins for Windows Media Player. It typically includes five distinct themes:

A dark, organic-inspired theme reminiscent of sci-fi horror. Invader: A sleek, high-tech interface with sharp angles.

Most alien stories frame the outsider as a threat to be eliminated. Alienguise frequently subverts this by revealing that the aliens are fleeing something worse, or that humans are the true monsters—invasive, colonial, unable to tolerate difference.