are there any manwhas with really good plots that are related to space maybe, just like ga...

https://www.mangago.me/read-manga/sahan/ but you probably read it

i second this, sahan is peak

https://www.mangago.me/read-manga/on_the_way_to_meet_mom/

Probably already read this too but the art is insanely good and it’s kinda sci-fi, set in the far future with aliens and gods and stuff kind of. Again, the art and the background art is amazing

YES YES YES OTWTMM!!!! one of the best manhwas ever

ITS SO GOOD I HOPE THEY MAKE SIDE STORIES FOREVERRR ;;

https://www.mangago.me/read-manga/grand_finale/