FSR is also on the Mac App Store. I would not rush to publish games on there, it has had zero sales since release and all Mac gaming related sites I contacted about it ignored us. 
About as expected, that store is dead, maybe only F2P games with IAP will make money so might be worth getting IAP to work for the Mac App Store.
Here are some promo codes for FSR on the Mac App Store. They expire in 28 days from this post.
76H6XX7JJLPN
4KNFPJMRX3Y9
J6M7XP49EEXM
PW3NJX6J9TRT
EYRLTXHJYLXP
MY6MAPARRFFK
XLMN3EH7NHE6
NPRNYXTEJFFL
JWNXK6YEJ7N9
M6AML6M3M77E