I think I just preferred multiplayer over collaborative as a term, risking the misunderstanding. It's a design tool, it doesn't have a game-loop, but it is built on a game engine, and was intended to be more physical and provide more tangible feedback similar to games.

Ideally 3 use cases, since one may not be relatable to enough people.

How about tackling one use case where Grid really excels and building up a really strong case and marketing material around that? Like one creative industry project. See https://basecamp.com/tour for an example of making a case study. People can be pretty imaginative about how they can apply a good tool, but right now we (first-timers) can't even see how it clearly works for one specific thing. You may be spreading yourself too thin before you have mindshare and losing people before we even get to see how great the technology is.