Song used in a game I can't remember

hello, this one's a niche one and I hope you guys dont mind.

the song had a name that was like "Friends, [Year] B.C." - the image used in the youtube upload was pixelart of (what 13 year old me assumed to be,) cavemen(?) on a prehistoric see-saw

it was a purely instrumental track, it was soft and music-box like. here's how I remember the melody playing out.

it was copyright-free i assume because i remember being introduced to it through a game that was on Newgrounds. I remember it was similar to Nicky Case's work, I thought it was the song from The Evolution of Trust but I apparently misremembered by a LONG shot, lol