Fine.

At first I thought this was also broken, because only I can see was just a blank white screen. But several secs later a music suddenly came out, making me surprised. There was a falling yellow ball, but I didn't know what to do not to let it fall. After another several secs I figured out the ball can be moved by pressing arrow keys. And I still don't know why there's an increasing black bar, with a vertical red line.
It was good for time killing, but you need to make it with more features, like black balls coming from sides, to make this more challenging. Putting "Play" button on main screen would also be a good idea for preventing automatic start. And a mute button seems to work just to "mute" sound, not to turn on again. You should make it toggle, and more identifiable. At least for me, it just looked like scribble, or maybe some kind of symbol.

vote: 2, stars: 3

fun gameplay but not enough variaton, also the artwork is crappy

Could use some more work

The game is simple enough and it is a challenging time waster. But from now on, put the instructions in the description. I failed the first two attempts because I didn't know what to do; my ball simply fell. I thought it was supposed to be a tetris game! Also try adding difficulty features and maybe a scoreboard.

Overall, a fine game.