Honestly think both acts of Kingdom Valley are the best levels in the game (I know 2D in boost games is controversial but the 2D stages in this game are all really good and almost as good as the 3D ones).
IVE NEVER LIKED THE 2D SECTIONS IN BOOST GAMES BUT I THINK SHADOW GENS IS THE FIRST GAME I CAN SAY I ENJOY THEM! THE WAY THE GAME USES THE CAMERA AND THE DOOM POWERS MAKES IT SUPER SATISFYING AND WAY MORE ENJOYABLE THAN ANOTHER OTHER SONIC GAME IMO ! SEGA DID A GOOD JOB WITH THE 2D PORTIONS OF THIS GAME !
This run is abslutely insane! Just by watching I've learned a lot of stuff but it will take a lot of practise for me to pull off what you did. I've been playing the game on and off for a week or so now but man you inspire me to improve. the Doom/Chaos Spear strat is insane
PERSONALLY I USE STANDARD BECAUSE I THINK THATS HOW THE DEVELOPERS INTENDED THE GAME TO BE PLAYED AND I THINK IT WORKS WELL. BUT I KNOW A FEW PEOPLE PLAY ON LEGACY ! AT THE END OF THE DAY ITS JUST PREFERENCE