Thank you!
I did think about adding rumble, maybe in the patch after the next one!
About other puzzle games, I've certainly considered it! Especially a tetris attack/ panel de pon style game since I've already made a crappy clone in the past (though that one already has a pretty good port on GBA).
Right now I'm focusing on adding all the "regular" tetris modes. When I run out of stuff to add, I'll definitely expand to new types of content!