I've tried playing Dead Detective yesterday and the game was stuck in eternal loading after I got my first achievement I thought it was my browser problem but after trying with other browser, the result was the same. Even if I played without logging in, I got same result
After some tests, I figured out that the real reason is because online save is not working. I've tested this on some games such as Battalion Commander 2, Diamond Hollow 2 and Infectonator and all of them have problem with online save