A few years? As In you expect them to play this game for a few years?
I'm not sure what exactly you are asking for, the kinds of games I think of, for 'logical thinking' are to complicated to be engaging for 8 year Olds in my experience of 4 children. They like watching me or their older siblings play them, but when their turn comes around, they would much rather play a 2d platformer or 3d Mario or Kirby game, than something like astroneer.