I haven't tried the games but I have used Steam and it was fine. Also a couple of games from Humble store which initially wouldn't install as they were 32bit and wouldn't run on 64bit Deepin, had to google the answer which was to use terminal to add something that made the games run.

Could you add your answer for users for future reference?

Yes you need to add this in the terminal:

sudo apt-get install libglu1-mesa:i386

(to play x86 games 64bit linux)

Thanks for sharing.  

Checked out deepin games and some of the games didn't look too appealing. Their web flash games so take it for what they are.  Some may be good for wasting time I guess.