Deb packages on MacOS
You can't install/run Debian packages natively, the kernel and a lot of required data structures are vastly different. Usually people who want to run Linux code


set up a VM and install Linux within in. VirtualBox is a (good) cost-free solution here, there are also Parallels and VMware which offer more features but aren't free
install Linux in a second partition and dual-boot either Linux or macOS. Install instructions depend on Mac hardware, macOS version and Linux distribution. 


Neither way will compensate for underpowered hardware though (the graphics to run the game in your case).