For general gaming, stick to trusted stores like the Epic Games Store or GOG . Everything Is For Humanity on Steam
The trade-off for a smaller download is a significantly longer installation process, as your computer must decompress the data back to its original size to play.
Files are encoded and packed using complex encryption algorithms, sometimes reducing a 60GB game to 30GB for the initial download.
The game focuses on a "hide and seek" style of survival, where touching a monster results in an immediate game over.