In short, spam B. Pressing B will make you ragdoll around but if you're already ragdolling, spamming B until you enter the get-up animation (usually takes around 3 quick B presses) will stop your momentum and make your character stand up.

my game crashes very often and it kills so many good runs, anyone know how to circumvent this? sometimes it crashes right when i start the run and other times i'll be mid-run. tried lowering graphical settings and reinstalling the game and such

So in All Stars% you have to get 3 stars on every level, when the maximum amount of stars on each level is 4? Doesn't make sense, All Stars% should be getting 4 stars on every level, and the current All Stars% should be called 3 Stars% or something that is actually makes sense