First, it's not the Groovy Godzilla version or the LemKuuja remix of the GG version. It had a more bubblegum-pop lofi before lofi was popular feel to it. It was cute.
It was/is(?) available on Bandcamp for a "pay what you want" price and because it's minimum was $0.00 dollars it was essentially free. The song began with the English dub voice of QT going something like "Dandy, Hey Dandy!" It was released during when the show was new so probably around 2015? My memory with dates is awful.
I remember the album cover being pink. It might've had either Meow or QT on the cover but just like a mid-shot or closeup of them but maybe it didn't and I'm just remembering wrong. It was pink though, that part I remember clearly.
I had the song downloaded on my old old laptop but that laptop is now dead.