Hard2Fly is Untested on macOS
Hard2Fly has not yet been tested on macOS.
About Hard2Fly
Challenge

Controlling all axes of a drone without stabilization, it just can't be that hard, right?
Crashing (a lot)

Brace-Brace! Drones will crash - almost guaranteed.
Fly 'round

Once you master it - enjoy a unique feel of flying.
Time Race your friends

Of course there is a global leaderboard for every track, but also a short list to see how your friends are doing and challenge their LAP times. However, you probably won't make it past the tutorial or around a single LAP because it's insanely difficult. Turns out, all those "drone pilots" are probably couldn't handle a drone without stabilization.
Crash some more (a lot more)

Conclusion?
Hard2Fly is very, ... difficult
macOS Game Tests
Hard2Fly tested on macOS.
Hard2Fly is not natively supported on macOS. See below for potential ways you can play it that have been tested.
Hard2Fly hasn't been tested yet on macOS.