This is just my request.
I recommend give s&box key for CryoKeen, he is one of the oldest map makers for Sven Co-op (Half-Life 1), and now learning make maps for Half-Life Alyx.
Keen - Sven Co-op Map Database - Maps
CryoKeen - Sven Co-op Map Database - Maps
Steam Community :: YTUBE[CRYOKEEN] PEACEFUL POTATO - Steam