Yeah thats where most players stop , the game opens up at this moment and the pace gets a lot slower . at this point the main upgrade path is almost over and the player has the choice of ending the game ( if they can find the last two upgrades ) or searching for the 100 % .
But I must admit that this part of the game isn't as well designed as the other parts where , its a bit too big and looks very samey all the time
thanks for your comment and playing the game , very appreciated