Case solved. It's ABP problem, turning it off let the game to launch normally (letters, numbers, something is going on etc). In my experience it's the first ever browser game interrupted by Adblock Plus.
Good to know! Sometimes adblockers interact with scripts, and my game is very heavy on javascript. I am running no ads so at least you should not be needing it here, but good to know for me in the future. Thank you!
