Not really a 'tag', more of a category, but Games.
A number of the projects in the Game section are interactive visual novels (i.e. choose your path), and some of those have limited number of choices. So calling them games is a bit of a stretch.
Renpy, for example, is a visual novel engine, not a game engine. Yes, RenPy can have game mechanics included in it, but you see my point.
So an 'Interactive Visual Novel' tag along with a 'Game' tag, well since we already have a bajillion tags anyways, having IVN or Game or Both at the start of the tag string might be a bit more helpful.
For example, a 'Sandbox' game like SimBro, well that's not really a visual novel, because it's mechanics driven (raising skill levels, fighting, etc), not story driven. The story just provides a suitable background.
Dreams of Desire, on the other hand, is DEFINITELY an Interactive Visual Novel, as is Dating My Doughnut Daughter
I suspect that no one actually cares about this, but yeah IMHO I think that the Game master category needs a bit of differentiation. Not a separate forum section, mind you, just a 'category/type' tag.