Sweet! I like the idea of allowing for demos to have their own page instead of being part of the full/finished game page. Not sure if demos should have reviews. That seems kinda beside the point.
If it’s an “early release” demo or something, like some games do with a limited time, partial access, demo? It should have its own reviews. When the game is fully released, I feel split. On the one hand, you’d be giving feedback for a small part of the game, but on the other you wouldn’t be seeing reviews about content not contained in the demo.