Psychonauts 1 is amazing.
There are many reasons for that: the adventure, the fun, the humor, the story, the game mechanics, the unexpected, and the fact that you discover new things every time you play it. (20 super fun hours each!!!)
And I think, all of these could be replicated in Psychonauts 2.
But, there is one thing that Psychonauts 1 has that I think will be very difficult to recreate in Psychonauts 2.
You start Psychonauts 1 with no Pschyc powers, you have to learn them and earn them one by one. And every time you get a new power, it opens a whole new world of possibilities, you can reach places you couldn’t before, and do new things, and you start thinking how you can use it in the places you have been before.
The backpack is full of merit badges, we've already earned them. To re-create the experience of earning the merit badges, they will have to remove the old ones, or add new ones. Not sure about any of those...
But I don't make games and Double Fine and Tim do, I have plenty of confidence they will make an Amazing game.
It's going to be so much fun!