The game won't start on mac OS Sierra, it simply crash during launch, does anyone have any idea ? Already tried to reinstall the mono framework form the installation folder, my system is a mid 2013 Macbook air with latest OSX Sierra no special development tools installed for cross development.

I am having this issue as well. It worked when I first downloaded the game recently. The first time I played it was fine. The second time I went to play, it started unexpectedly quitting during launch. I tried a bunch of things after doing some research and eventually downloaded the latest monoframework pack and installed it. That seemed to fix the problem for a few days. Now I have the same problem and it won't start. 

I've tried: 

Uninstalling 

Unchecking the steam overlay

Unchecking the cloud sync

Verifying integrity of game cache 

Checked my firewalls and security settings

Installed latest momoframework pack which worked temporarily. Tried reinstalling but no effect. 

I tried switching to the 32 bit version through steam. The game starts but then gets stuck on the title screen. 

Comp specs:

MacBook Pro Late 2013

2.4 GHz Intel Core i5

8GB 1600 MHz DDR3

Intel Iris 1536 MB

Same problem here.

Mid 2012 MacBook Pro

2.3 GHz Intel Core i7

8GB RAM

NVidia GeForce GT 650M 1GB

It used to start perfectly. I'm more than disappointed.

I try your issue but this don't work ... It's more than month I can't play ... I already try to re-install Steam , then re-install the game but nothing work ... I was hoping your issue could resole it but No !!!

IMac 27 pouces  processeur 2,7 intel core i5   20Go mem   AMD Radeon HD 6770 512mo

Just buy extension and will want money back !!!