Lots of bugs

You should do some serious bug-testing before you submit your movies. In a few occasions this Tetris-version does not remove the pieces accurately. Aside from that, you should make sure that the player is able to move the pieces sideways BEFORE there is contact between the piece and the "floor". Look at the original version to understand what I mean. The scoring for this version is very odd. Why does it increase your score when you press the down arrow? I do not mean to be overly critical but if you are going to copy an excellent game like Tetris, at least make sure that it´s as good as the original. For programming practices however, this is a very good game to begin with...

This is a very good game

I like your game a lot. It´s simple and clean. Original idea, intelligent level design and fun to play. Keep up the good work.