Sounds interesting, But the crypto game market has no user right now. It is so hard for game developer join the Crypto world.
Who say it can't be the next Uniswap? Demand and supply decide the price of anything.
I think you are mistaken about crypto game market having no user. Probably you have not taken interest to the existing crypto games. If you browse crypto games, there are many player spending their ETH, or other token to take part on that game.
Of course, decentralized casinos use similar technologies. Mostly I saw those casinos that use the Tron blockchain, but I think if there was a framework like STONE, it would allow the use of, for example, ERC20 tokens and many token holders would be very happy.