There are two different programs with the franchise name which apparently air back to back on saturday morning, here are their respective ratings for the first 4 episodes :
銀河へキックオフ!! (NHK - 9:30)
銀河へキックオフ!!～Jリーガーに挑戦～ (NHK- 9:55)
It's worth noting that the second one is in direct competition with the reruns of One Piece which bring in quite good ratings.