Level 1: During and after intro hold right key, and jump before the player hits the transition hitbox at the end of the screen.

Level 2: If you timed the jump properly you can just hold both up and right keys, If you did it correctly you'll wall jump on the left side of the grass platform as well as jump on the right side. after walking/jumping off of the pillar you can either slow down and do the transition jump or let your player jump around.

Level 3: If you jumped its the same deal as the first level but when you jump on the 1st pillar you wanna always hit the transition hitbox making it unlikely for any bounces when landing. but if you didn't jump, for me it feels slower but just hold right and up keys and almost the exact same result will occur.

Level 4: If you cancelled the bounces from occuring you'll be able to hold right key and jump without risk of dying. same as Levels 1 and 2 jump right before transition screen

Level 5: From the jump before you'll be able to jump over the first spike, but no matter what you'll need to slow down a bit and wait for the hopping to stop so you can jump straight over the 2nd spike and straight into the next level

Level 6: at the beginning time the jump so you don't fall into the trick floor and continue right to the next level

Level 7: Hold right still but press left to make sure you don't hit the wall mid way after jumping on the trampoline, continue holding right after landing

Level 8: time your jump to get over the saw and do the transition jump again

Level 9: Transition jump your way over the first spike, just in case crouch mid air to dodge the 2nd spike, and lastly wait to stop hopping then ascend over the last spike beating the game

This is a quick and brief explanation I made, if there is any mistakes or confusing things, I'll probably fix it in the future when I either get told or find it myself

P.S add in the rules: Time starts moment Player Moves, Time ends right when you appear in the last level (or something else idk)