From your log file, you were loaded into the game properly.
Are you using an AdBlock plugin in your browser? If so, this is probably the cause of this error. It will block the ad and the end/skip process associated with it, which prevents the game window from appearing.
If you are using AdBlock, disable it when you use Kogama - or add Kogama to its exception list.
If you only want to block game ads, add a filter rule for the following address:
This will allow the game window to load without any problems and completely prevent the ad preloader from ever appearing - which means no blank screen for AdBlock users.
Personally, I would recommend disabling AdBlock for the entire website - because Kogama gets most of its rev from ads. But I offer this as a compromise... only block the address above in order to disable game ads, but allow the banner ads to load on your page. This way, you're still benefiting Kogama somehow.