Sorry for the slight lateness of this reply.
First of all, thank you very much for the comment on my game!
Secondly, the answer is no, I haven’t actually heard of the film Primer. My title was a reference to the primer, i.e. small explosive, used in modern bullets. Fun fact: the game was originally intended to be titled Percussion (in a reference to percussion caps), until I did some research and found out that modern guns don’t actually use percussion caps. So I went with another slightly obscure reference to gun mechanics.
Can’t wait to have time to play the other entries. I always enjoy participating in Ectocomp, and this year was no exception.