From what I could see after Peridot's introduction we are going to see Jasper and after that we can explore new zones and get new routes with Lapis, Peridot, Jasper, other invader gems and Bismuth (also counter mentor which I guess is the other gem that we don't choose at the beginning) after that we go to homeworld and then we obtain access to the zoo and homeworld where we have the zoomans, spinel, the diamonds and the homeworld gems. Finally the end where we face the cluster and finally the prologue.
I posted this because I couldn't expand the image and it's kinda difficult to see if you don't zoom in.