Blue (not many save's but most basic world)
3- You can skip to the 2nd platform its possible and hopefully can skip the waiting for the moving blue platform
5- You can double jump from the 2nd platform and onto the 4th little area leading up to the trampoline
10- Barely any points to use it effectively but you can double jump to a set of two platforms at the start that lead up it may be faster?
Pink (compact levels shockingly not used much)
11- Ig double jump off the last platform?
14- Double jump to second platform in 2nd room (probably not needed)
17- jump to the high up platform at spawn
Green (contains the first major skip of the run other then that mostly dry)
23- after collecting all the keys YOU CAN DOUBLE JUMP TO THE FLAG!!!
26- in 3rd room double jump to first green to skip bouncing off the chicken
30- Double jump to the L then you should be able to double jump onto the pillar end the level normally from there
Purple (not great... This world is less exploitably with double jumps and more general improvements like cleaner gameplay are needed for it instead)
33- You can get onto the triangle and get top key first i suppose
34- Get to 2nd stair easier with double jump
Red
42- ok so... this is just a theory but i really think it's possible IF WE DOUBLE JUMP OFF THE UP TOKEN PLATFORM WE COULD GET TO THE FLAG maybe we could also jump on the 3rd platform bottom in upside down as the second one won't work but i thinks its possible to skip it
but also you could maybe double jump to get the down token without all the moving platforms
43- jump to top platform in room 3 and get the gravity token
46- Double jump for gravty token
49- Double jump to 2nd disappear block
50- Not really double jump related but clip inside the fading cubes at the start
since a lt of jumps are made to be barrely out of reach, so the double jump can be very useful
I just checked back on this game after 8 full months. I'm glad some people are taking use of it :)