That's one type of ganache Mariu, sure...."poured ganache". But "whipped ganache" makes an entirely different icing. It becomes, fluffier & matte...more delicate really.
I've done wedding cakes iced in whipped ganache. It's really pretty, but man oh man it's tricky to whip up without over-whipping like the OP did and even harder to smooth.
I won't do it often.