What's up with 505 Games? Stock is +250% since May!

I owned Digital Bros, also known as 505 Games, earlier this year but can now clearly see that I sold too early.

I really can't understand why the stock is having this insane year-end rally. The stock is up 250% since May and is probably going to be one of the best performing gaming stocks of 2016. 

I know they have had some cool and award winning niche titles such as Abzû, Virgina and Adr1ft and that they own the retail distribution rights for mega-hits like Rocket League - but I still find the rally in the last few days impressive. 

Somebody who is following this stock more closely than me, please help me understand.