Had another dream where it played like Dark Souls, albeit more emphasis on magic, and you could travel in the 8 cardinal directions to reach higher and lower levels of dimensions, gameplay wise this would change difficulty and essentially generate new areas in the direction you travelled.

Had a dream about FF10 where instead of Sin, the planet was heading towards a region of space with like 20 actively summoned space storms in the shape of infinity akin to the Second Umbral Calamity. To save it, they had to ride giga powered aeons into space to stop it.

A game idea I've had in my head forever which I'm surprised has yet to be made is a werewolf immersive sim. Get new clothes each day so the residents don't suspect you, feed to satiate your hunger etc.