No you can’t, not conventionally anyway.
I would always push for people to be open and supportive of code analysis, it’s an indespensible way to both teach and inspire the rest of the community.
Very few people will be callous enough to copy and paste code line for line without your permission, and those who do are just cheating themselves in the long run.
I go by the “credit is very much appreciated but not strictly necessary, just don’t try and lay direct claim to the code you use”.
So if someone uses my code and it helps them make a better game, credit or no, I’m happy with that. What I can’t stand is someone taking code that isn’t their own and then slapping something like “Coded by me” on the end of their game - when it’s blatantly not 
But generally speaking I’m very supportive of an open source/free/shareware/creative commons approach to CS code.