I just uploaded a version of My Mom is a Witch for MacOSX.
The game has been developed using MacBook Pro with Intel HD Graphics 5200. It has also been tested using MacMini with Intel HD3000. It runs 1920x1080 at 60fps without any problems on both of these configurations.
The Mac version has all the same features as.the Windows version. Even cross-platform multiplayer works. In other words, you can play a co-op game on Mac together with your friends on Windows. Just make sure you run the same version of the game (currently it's 1.2.0).
Linux version is also being prepared, but I cannot give the exact release date yet.