We've got a Winner !
Gratz' Gameboy I'm still surprise someone know it, But I heard that Eastern Europe have fans of this movie (I believe - but I may be wrong - that It was available In Soviet Union before the Wall felt down).
(Also Gratz' Ilytch - Next time be faster, will ya?)
It was
Time Masters (aka Les Maîtres du Temps) Based on Stephan Wul's
The Orphan from PerdideSynopsis :
Piel is a young boy alone on an hostile planet far away with an subspace communication device. Piel believe the mike is a living creature with many voices. At the other side of the galaxy a team try to reach Perdide in a rescue mission.
And, Yes it's one of the best Hard Sci Fi made. I cry at the end every time I watch that.
Warning : Not to watch with young Childrens : it's kinda violent and Psycho at some moments.Gameboy : the thread is yours.