Also while I am making a game, you can give me some advices and I can add something else (not only on single space game).
Please bring on something new, which has not yet been implemented before. For example, Pokemon Go type game where bitcoin can be won.
There is already one, if I'm not mistaken, it is a Ponzi site out there where you are going to collect pokemons and you are going to battle it with somebody or to the A.I on their site (I'm not sure, correct me if I'm wrong), but is not a 3D game, so if OP will going to put this Pokémon Go in his gambling site, then, maybe, it will become popular in the gambling world.
But it is still depends on OP though if he is going to put this up on his site, though, a really unique game would really do, and not the existing one.