I like this game because it is very polished. It's simple enough, but everything is done well, from the fun factor, art style, and audio & music. The tutorial is also very helpful, and it's nice you've managed to put it in this game jam submission.
The only feedback i would give is maybe the combo pop up in the center is too big, that it might distract the player from seeing the shape(s) correctly. Other than that, everything else is crisp. Great game!