The way we developed Paragon Slots (Our retail slots game released on Steam) is that we focusing on only a slots based interface. The way we are building Casino Box is so that we can offer Slots, Keno, Poker and many other game types.
In this development image we’re adding in the visual “Win Lines” for games that support them. The first free game in Casino Box will be Buffalo Plains Slots which does support selectable win lines.
And yes, we are using unity for Casino Box, we have been developing in it for over a decade with more than 30 retail releases of ours using it as the game engine.