When I tried to open the application on mac it said "file not found", but I right clicked and went into the package contents and went to Contents/MacOS/Linebirds and opened that and it worked great. Very fun and challenging puzzle game. Good work!
Strange, I used the same method for uploading a Mac game file I've used for years. Oh well, glad you got it to work. :D
Yeah maybe it was my computer being weird. I'm glad too, it was a lot of fun!