Install Windows on it are you stupid.
Buddy 1. Not everyone knows how to use boot camp. 2. Not everyone has 30GB+ of space on their HDD/SSD for Windows 10, plus Steam, plus the game. 3. Not everyone wants to pay $129 for Windows 10 to play a $5 game. 4. It would be easier for the developer to port it to Mac than make many other people boot camp their Macs to run Windows 10. Finally 5. Don't call people stupid, it makes you sound ignorant and rude, he/she was just stating a question/suggestion for a Mac version.