Thanks for playing and for the valuable feedback!
You actually gain a gold piece every time you clear a line (it may be too much!), and they keep on coming as long as you have a lot of holes to fill actually. They stop once your chaos level is low enough or you filled most of your holes to save them up.
I am aware of a couple of bugs and some counter intuitive behaviors, but I love Tetris and I wanted to add onto it as an inspiration. What could I mess up with Tetris, right? Nothing can go wrong... :)
There are actually more chaos pieces (X/C/M/W). :)
And the singles are only appearing when there are holes, broken pieces and certain amount of pieces and threshold of lines.
I learned a lot from making this game. Thanks again for playing!