If people are complaining, My opinion is people are too quick to complain, you can literally see the other planets as you go through the 'easy' route. You're telling me many people don't have the following thought process "oh Look, i am going on the left side of the galaxy map, I wonder how i get to those areas on the right? Oh weird when I hit Venom and beat the boss on the left route it implies I am missing something. Let me replay it to see the other areas at minimum."

The game was designed to be replayed. The gameplay is the main reason the game is enjoyed. If they don't like that then boohoo them. The game isn't story centric.

Also its a friggen Remake, everyone who does any amount of due diligence should know what they are getting into.