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.