I think the gaming idea is too weak to have its own Tokenize assets. The NFT part is alright but i dont see myself buying a screenshot as an NFT art. Maybe others will but i dont think there's a market for screenshot in this space.
Look in another way. A unique video of an incredibly rare happening in the game or a testament of luck/skill that no one in the world owns but the NFT owner. Let me know what do you think about this approach.