That would be an interesting implementation for Onigiri. I'd like to see how that would work out. However, I don't think there will be PVP for a while.
As seen in that old trailer, pvp does exist for this game, and it's likely in the form of a point-and-click MOBA. I'm not surprised it's not out yet, the game still needs a lot of work for the pvp to be good and successful.