Sorry the game didn't work for you.
Yes, you can get a refund if it's not working for you on your machine, just shoot me an email (steve@cairn4.com) from the one you used to buy the game and I can forward the request along if you'd like.
Have considered removing the Mac version, but haven't because on some Apple machines it works fine without any issues (like on my Mac mini), while others experience the launch issue you mentioned. Still haven't been able to figure out why.
In the meantime, will at least either make it super clear to buyers that the Mac version might be crashy or drop it from the store listing for now.