HRM looks fun. Bought it. TIS100 notsomuch to me. I can see the appeal for some thou.
TIS and Shenzhen I/O on the other hand have unique challenges and are well worth your time investment for help thinking outside of the box. Many different ways to solve the problems, unlike HRM where there is basically one obvious speed and one obvious size solution.
I'd love to see more assembly-like games. I've hear about Core War, well so far there are no new exciting progress.
The main game is only half the story though, fully optimising the later levels and especially the optional challenge levels is not trivial!