I can't stand the mist and I think the landscape is terrible.. the cape changes the entire game. That should be able to be gotten with the first 5 cores should not require all 15.. by then it's too late. By the time you get the cape you are basically done with the biome and ready for the boss.

Second thing I would change is make the wisplight upgrade to T4 and each upgrade doubles both distance and speed at which the wisp clears around you... both those changes would greatly improve player experiences.

As it stands now I will probably just mod out the mist altogether and reduce jump stam drain by 50% my next play-through.