This was a pretty good game. I’ve never gotten to level 20 before, so speed–depending on how close to the original you want to implement–could be reconfigured slightly. I’m curious about the humans, dragons, and the little faces on the blocks themselves. I tried lining up 3 little faces to see if something happens, but I never could.
If you decided to continue working on this after the jam, consider adding a ghost piece that shows where the piece will land. That always helped me a lot. One other thing–When you add menus or a pause feature, would you consider adding alernate controls? I played a lot of one version, and for me, the up button was to rotate the block. Other than that, it’s great! I had a blast.
When you said it was a little buggy when rotating near other pieces–I didn’t witness that. I’m not too familiar with how Godot does things, but in JavaScript, I would assume that each square (not block) is considered an object, and find a way to make the block as a whole part of the background. Not sure if that makes you think of anything or not. That was my first thought, though.