Damn it. Went to dl it and it's PC only.
There is a free program available called Wineskin that allows you to run windows programs on your mac. It might seem a bit confusing at first, but the whole process is surprisingly easy and takes no time at all. I just tried it on my Macbook Pro and was able to play fine, the only problem being initially figuring out the random keyboard configuration (couldn't press F2 to display controls, haha).
http://wineskin.urgesoftware.com/tiki-index.php?page=DownloadsOnce you install Wineskin, and open it, all you have to do is click the button "create blank wrapper", and name it whatever. Then you can just drop the Megaman file right into the wrapper you made and it will automatically start playing. Just make sure to stay in full screen mode the whole time you are playing and everything should be good.
Edit: Sound doesn't work. Fuck. That pretty much ruins it for me. Stupid macs.