Apart from it’s metallic gold colour this is a very (very!) tiny “long-legged fly” that has flown so far under the radar that it doesn’t even have a common name.
There are 7000 species in the family Dolichopodidae. They are generally small flies with large, prominent eyes and a metallic cast to their appearance, though there is considerable variation among the species. Most have long legs, though some do not. In many species the males have unusually large genitalia which are taxonomically useful in identifying species. Most adults are predatory on other small animals, though some may scavenge or act as kleptoparasites of spiders or other predators.