21 Grams of Soul by Altanerus Dog is an Amstrad CPC game.

You can download 21 Grams of Sould on Itch.IO as a tape file or as a disk file on CPCWiki.

Incarnate the soul of recently deceased Jocob Still, inmate of Dauer psychiatric hospital on a small remote island. You must manage to leave the place within a maximum of 1 hour, overcoming all obstacles, always avoiding darkness, vermin, or any black object. You can only interact with the electricity, so you'll have to operate certain switches to make it easier for officials to open doors or turn on lights. On your way, the recovery of four wandering souls is required to provide you with the necessary strength to reach the sea and find the light.