Seems like an interesting project and an example of what direction the Bionicle community should take. Majority of the Bionicle fanbase seems obsessed with the lore and the finer elements of it, but they're kidding themselves if they think they aren't beating a dead horse at this point. Creative projects like this that take the IP elsewhere (even if not officially) and keeps the community healthy as well as creating a whole new avenue of exploration for artists, builders, or even just story tellers.
As for the game itself, I'm not too big on the idea of using actual figures in-game; miniatures would be better adapted for this but I understand why they haven't implemented this. Finding someone to play this with must be a pain because they have to not only be into Bionicle and /tg/ stuff, but also have a decent selection of existing Lego pieces and I can't see there being that many people out there.