Impressive Work!
Personally, I would not be able to bring myself to develop games in assembly xd but for a QR Game jam it's probably the best choice.
Very well compressed!
I also love these games that make you think! So IMO it was also fun! I just had a very hard time grasping the goal at the beginning and the control. J, L seems like an odd choice to me (opposed to a and d or <-,->). Also did not like the colors used that much. It's a preference thing I know but I feel like a better distinction between snake, black, and lights on could have been made.
Great stuff!