You don't seem self-awared of your plan.
Alright, so you want to build an NFT Game, but with Bitcoin. Do you know that Bitcoin isn't
turing-complete? You'll have to work on a project that is, such as Ethereum.
Not only is Bitcoin not equipped for this sort of usage, but fees would make it pretty difficult to build something usable. Ethereum makes it incredibly simple to build this sort of thing, but again, fees are a major drawback. That's why we're seeing chains like Polygon kick everyone's ass with usage suddenly. Low fees and usability can't be compared with ETH or BTC. I'm not familiar enough with the chain to know the drawbacks of this combination, but I know if I were building a project like this today, I sure as hell wouldn't be looking at BTC or ETH.