Make sure you've properly licensed the code, people have no conscience sometimes and will release your game again without crediting you...
As far as people re-releasing our game is concerned, the source code DLC is licensed under the Steam Subscriber Agreement with a few added grants for mods and making videos, so legally nobody is allowed to re-release our game as a whole or even reuse the non-MIT parts without asking first. If anyone wants to re-use parts of the game in their own game, they are encouraged to contact us. (We definitely won't make a fuss about minor parts of the code when asked, but re-releasing the entire game is out of the question.)