Thanks for making a Mac build! The city is fun to go around, although it's hard to explore when the ghouls are around, of course. Found myself often hitting the e key instead of the r key to reload, so I'd probably rekey it if I could (although I understand that the "r" stands for "reload," so it's the best default key for the action). Aiming wasn't as bad as I would have guessed from the stream, although like in the stream, I think I found going out of the main building area made managing the ghoul horde much easier for me.
Great job overall! There's a lot of polish here, and that parkour-ish shooter idea that you were aiming for is executed very well by what you made. I made sure to leave a good rating for a job well done!