I think you could link them to
Thanks, that seems to work!
This will do, although the comment box is a bit out of context. You can’t read other replies or scroll up to see the game description or add a review instead.
So a link that would open the game page scrolled to the comment section would be even better, but your answer certainly is fine too.
EDIT: just found out that anonymous users get presented with a login dialog. That will scare to many people away, I think. So my best option so far is to just use my game page then, which is available to non-logged-in users