They have confirmed that my problem did exist, on their forum.
Problem is now resolved, they have sent me the full amount to requested address.
The only sad thing is that it required me to bring the situation to public.
Thanks everyone

What happened
I had BTC on Bitcoin Games account (games.bitcoin.com). Yes, that one by Roger Ver. On Friday evening I tried to withdraw entire balance to my wallet and instead of usual message got this one - "This withdrawal must be manually approved by an administrator. This usually only takes a few minutes, after which you will get your Bitcoins. We are sorry for the delay".
After that, BTC has dissapeared from Bitcoin Games account, but there is still nothing on the address I ordered withdrawal to. 5 days already left!
I tried to contact the Games team by the only contact they published on their website - email games(at)bitcoin.com. I have sent them 2 letters, but never got answer.

Scammer website
https://games.bitcoin.com/

Amount Scammed: 0.2 BTC or ~2.300 USD
Username of Bitcoin Games account is 4ceb8d9074.
I can give access to account to a trusted person if required.

Additional notes
As they ignore my emails, I created a thread on their forum - https://forum.bitcoin.com/technical-support/bitcoin-games-money-dissapeared-after-manual-withdrawal-t120487.html
I also create a duplicate post on BitcoinTalk, because this all starts to look like scam. I am really worried, so I made this situation public. I ask Bitcoin.com team to return me my funds. Thanks.