My mate can't move in the co-op game. Does anyone have a solution?

Hey i tried this jump twice, the 2nd time getting me further but im not sure if this jump is even possible to make? https://www.twitch.tv/johnnyspectronyt/clip/SecretiveInexpensiveTardigradeNononoCat-VzDyYJ3_F1o7BVsA

https://www.twitch.tv/johnnyspectronyt/clip/CoweringInspiringReindeerChocolateRain-7ZbOu3Z-igO8xWQa

I was one of the privileged to test this game. The first time I saw it, I must say it was very interesting. When I actually played it, I was not disappointed with the design. But yes, it has some bugs. But because it is in the development process, I understand it. And I hope that in the future, this game will be developed as well as possible. Because it is very worthwhile to play.♥♥...

If you fall in the third level, you fall forever. It's funny but stupid because then you have to start again XD