Part 2 of the development process, which covers jumping, acceleration, the start of wingsuit physics, and some sound design (splat!) is up here:

https://www.youtube.com/watch?v=6vONW-PTXk8

(Also on dailymotion, if you dislike YouTube: https://www.dailymotion.com/video/x8163zt)

Part 1, if you missed it: https://www.youtube.com/watch?v=Wt2zly-9BYY (dailymotion: https://www.dailymotion.com/video/x812i6z)

And my entry, Soaring Under, if you want to check it out: https://ldjam.com/events/ludum-dare/48/soaring-under