How to set the height for item usage? (Wings of Icarus issue)

Hi everyone,

I have a problem with Wings of Icarus. When I try to use them, they just fall down instead of letting me glide (when I press SPACE). It feels like there should be a setting or a zone that tells the game where the ground is so the wings work correctly.

Does anyone know how to fix this? Maybe there is a parameter for setting the height?

Thanks for any help!

In the video, if anything, I hold down the SPACE BAR.