Someone told me about this trick for Lunar Whale. This trick would come in handy in all categories. For the trick, get to the 2nd checkpoint and then when the floor appears you can clip in it, you can get 75%ish of the cube in it, once you are a bit in the floor, nothing hits you and you can just stand still. You don't need 75% of your body in, only a bit is needed.

The thing is, I can do the tutorial levels S Rank easily, however the only way for this to save time is for you not to die once on the challenge levels, and then what if you don't get LLtNF?

Damageless% and FullReset%. For FullReset% you would have to reset story mode. This is simple because you just need a 2nd account.