It looks like they’re releasing a sequel soon, so I’m guessing that’s why it’s free right now. Not the first game on the Mac I have that became unplayable fairly quickly after release. Actually, looking at the release date of 2021 for the game, it was never playable except on older Macs, because macOS Catalina (10.15) was released in 2019 and was the first version of macOS to not support 32-bit applications. So the game was already 2 years out of date.