It's also a foundation of childhood memories for 90s kids here in Norway (albeit with voiceovers, as we tend to do for children's stuff). I can still hum the intro tune. And perfectly hear the sound the moomins make when they go from standstill to moving. And the Groke still creeps me out, and anyone my age gets a reference to that character right away! https://en.wikipedia.org/wiki/The_Groke

A wonderful video that references several children animes of that time, including the Moomins: https://www.youtube.com/watch?v=wJSk3sh3zlo