i've been struggling to improve the old camera system (which is why progress has been so slow tbh) so its fully barebones just to be playable while i work on the real camera, the temp camera has broken stuff like the vehicles though and i figure its not worth fixing em til i finish the camera
there is a hint in level for the yellow gem, but i'll give you another one if you still can't find it
the bridge jump is pretty hard, will need speed tech for that
neutral slide is the start of all combos, just stop holding left or right (resetting the stick to neutral) after sliding
follow that up by either jumping or spinning for a neutral slide spin (NSS) or neutral slide jump (NSJ)
you can also neutral glitch jump (NGJ) by pressing spin and jump at the same time
you wont lose neutral speed if you doublejump during the first spin of NGJ (NDJ)
you can start a neutral tornado out of NSS and NGJ, but you'll lose more speed the more times you pump it
got all that? good.
now, just NDJ just before the bridge flattens out and space out your tornado pumps for max distance, easy!
try doing a NSS off a ledge and jumping near the end of the spin for some crazy mobility, and if ya want to go stupid fast, start a neutral tornado in the air and then land on the ground while still spinning for a mock tornado
