Welcome to the sorta official group of Red Sky (all rights go to ika you numb nuts)

Game Install - https://ika.itch.io/redsky
His (number) game ika is a single devoloper with extensiveish coding knowledge. He made his own engine called Sigma (what Red Sky is made with)
He is in the process of making Sigma 2 a much better engine that will take out the glitches and the unneeded meshes. This game is mostly to speed run but can also be played as a normal FPS..