Being a game developer that can promote the whole cryptocurrency is a nice way to easily spread the knowledge to other people. I think one of the topics you should include in developing your mini games is basic like saying the importance of bitcoin for people and/or how bitcoin works but not just bitcoins include also other coins.
I think that such games will help people to know more about Bitcoin and blockchain technology. It is good that appears games that educates people and explain how Blockchain technology works. The more people will understand how Bitcoin is working and how Bitcoin is useful the more people will use Bitcoin. It will increase the value of Bitcoin.