Level 2 | 1st Flower | pretty straightforward.

Level 3 | 2nd Flower | also pretty straightforward.

Level 4 | 3rd Flower | you want to jump to the left from the 3-5 (5 if you count the bottom 2) metal blocks stacked on top of eachother, hook the floating metal block, and swing until you get enough momentum to where you can grab the flower.

Level 5 | 4th Flower | pretty straightforward, just swing from the roof.

Level 6 | 5th Flower | also pretty straightforward, again, just swing from the roof backwards into it.

Hidden level 1 | 6th Flower | on the level right after the 5th flower, you want to hold left (without jumping), you will fall into a secret level in which you can find the 6th flower, which is pretty straightforward to get, after you get it and you exit the hidden level, you should reset (faster than falling down obviously) because otherwise it's difficult to get enough momentum to clear the gap.

Level 10 | 7th Flower | get to the end of the level, then swing from the floating block backwards, build enough momentum, and unhook and hope you reach the flower.

Level 11 | 8th Flower | do the any% strat or whatever, then when you reach the end platform, hook the block backwards (if it isn't already under the flower) and then jump down and grab the flower.

Level 12 | 9th Flower | use the same any% strat, but do it on the 2nd block, not the 1st, in the middle of the 2nd block, you will find the 9th flower, after the 2nd block falls, you can not make the jump from the 2nd block to the hole without hooking, just so you know.

Hidden level 2 | 10th Flower | you want to land on the block in the middle, hook the falling block towards you a couple of times, then jump left and hook the roof so that you land on the falling block, after you enter the hidden level behind the falling block, it's pretty straightforward.

Level 15 | 11th Flower | you want to go inside the water, there you will see the flower, but it is pretty hard to get to without using a glitch which is extremely hard to do without an autoclicker so there's no point in explaining it, but to get the flower, you want to hook above the water, get a bunch of momentum, and shoot yourself down enough so that you can reach the very bottom of the water, once you hook the bottom of the water, you want to swing back and forth, going lower each time, and re-hooking the water every time you go lower, until you're low enough to go under the platform connected to the flower, so that you can just walk into it, after you've gotten the flower, you want to jump while going right, so that you can exit the air bubble.

Level 16 | 12th Flower | pretty straightforward.

Level 17 | 13th Flower | also pretty straightforward.

Level 19 | 14th Flower | also pretty straightforward.

Level 20 | 15th Flower | also pretty straightforward.

Level 21 | 16th Flower | also pretty straightforward (I've gotten it accidentally a bunch of times while doing Any% speedruns).

(PS. if you are using the github to check in which levels the flowers are located, the github starts at level 0 instead of level 1)