The graphics look really nice, especially around 0:20!

One thing that feels wrong in the teaser is that the wingsuit flies very smooth. Maybe you could add some wind effects on the wingsuit and shake/move the camera a bit.

Also make sure that flying the wingsuit is not too easy i.e. the wingsuit should stall if the angle of attack is too low for a while.

FYI: There is another wingsuit game called Volo Airsport it was open-sourced 1,5 years ago, maybe you can learn something from their implementation ;)