wow.

you should be sued for taking tetris and ruining anything that was fun about it. You screwed up the controls (sticky speed-up drop) and the yellow block was f'd up.
Bad boy. No.

It is Tetris...

and a poor version at that. It is not at all original and the controls are a bit difficult to use. Sometimes more that one block with drop at full speed even though I only intended to drop one. The blocks do not always more to the side or rotate while falling at full speed. I've seen this game recreated about fourty times and this one falls near the bottom of the middle of the pack.

No you didnt

Now im almost certain i have seen this before. Years ago, and without bugs.
How dare you...
And yes about the bug. I used my old strategy where i build up a massive tower with on slot for the long blocks. And then when i did it, on of the vertical lines dissapeared also. Im not sure but i do not remember it ever happening in the original.

Just a tetris rip off

This game is just a tetris rip off and it's not even good, why bother? I found the controls infuriating, the music annoying and in general the game frustrating. Obviously you put alot of effort into it, but why?

Entertaining!

I have always enjoyed Tetris, and this is a worthy adaptation of the old classic.
Some pointers I have, though:
There is an issue with the yellow block that moves it horizontally when rotated, and that tends to create some issues with last second rotation. Please fix it!
For people who play Tetris for long periods of time, the music might get a bit old, so it would be really great to have a couple of different pieces playing in the background (preferrably a remix of an original Tetris theme, just for the nostalgic value).
It takes a lot of time to get used to using the up arrow key for rotation and having no reverse rotation (especially if you assume the reverse rotation is the down arrow key and find your blocks dropping like flies instead of turning).