A great game and nice sound effects . The only thing which could be improved is that you have to repeatedly tap on the arrow keys but then again that is fun too.

Great job, it felt really good to unclog the tetris board. 

Very cool, took me a second to understand how the multiplier worked but once I got it I totally understood. Super cool idea, very different way of playing a game!

Cool take on the theme! Unclogging the pieces felt satisfying!

Neat idea. I don't think I would have ever thought of a reverse tetris concept, so that scores high on my creativity scale!

My two (minor) wishes:

1. Since I was playing on a touchscreen laptop, I kept trying to touch the piece to select it. Touching didn't work, I had to select with my laptop's touch pad. I wish I could have touched it using my touchscreen

2. I wish I could hold the arrow keys to move the pieces rather than needing to constantly tap the keys. Granted, press and hold would surely need some fine tuning to get right, but I think it might make for a nicer user experience

Wishes aside, I enjoyed playing. Great Job!