No you cannot, don't do it because your coins will get lost in Bittrex and it will be a huge hassle to try to get those tokens back. Since the distribution period has already ended, you should contact the team and ask for help as to how you should get your tokens because I think some have stated that the crowdsale page is locked and you cannot input a wallet address anymore. I'd recommend joining the slack channel because the team and especially Jack are much more responsive on there than on here, so you're much more likely to get help there.

https://gamecredits.com/slack.html