8/10. I think it's not a D18. It should be D19 or even D20.

Didn't like how the holds were elaborated in the beginning (there is no space between them).
Many sections of the chart are heavily focused in the middle, it looks like a half-double rather than a regular double (excepting the last part).
It might be too hard for a 18, I would consider rerating this as a mid-19.
The ending is just 'nope'. It killed the mood.
I will still give you a 10 because of the effort put into this. Even though I don't like many parts from it and that the ending is completely out of question, I am a cool guy.

I played it with 1x speed and this chart makes worse....

it's repetitive in some parts but i liked the long effects
D18 -19

I Don't like the Holds effects....