Well he did say it’s just a showcase of his skydiving system, not a full game. Unless of course you mean that you are just falling a normal roblox fall, then I would suggest you hold the F key while going down as it seems to bug sometimes and require you to hold it.
Pretty cool system, the animation is nice. Although as mentioned above by @CheekyPine it seems like there is a problem with how it works. As I’m pretty sure skydiving is supposed to be downwards rather than in all directions, but it did make for a fun experience.
It felt more like flying around like superman than skydiving, which is not bad but doesn’t seem like the intention. To make it more like skydiving you might need to try to tweak how fast the character gains velocity as it was very unrealistic and also fix the directional issue.