It is GameMaker game and it's mind-blowing that they got out such versatilty in 3D because in GM it's all hands-on handling 3D camera and I can't imagine how they did collisions. But I'll find it out from source I got on their Patreon.
It's a Patreon tier on 10$. Dunno how long it will be available, because it seems they hold them for a month and that one is there for 34 days. I'd say if you want it now is the time.
