This game is really well made -- the visuals, sound effects and music all come together really well. I also enjoy the mechanics -- the intuitive power spike from building a quad or a penta versus going for easier singles and doubles is a really great mechanic, and one missing from the original single-player Tetris

Sometimes I die because I was trying to build a huge chain reaction on the side, but i made it one square too tall and trigger the "Block Out" losing condition, and I've sometimes run into bugs which prevent pieces from filling in gaps. Or I press the hard drop button a fraction of a second too late,  causing my NEXT piece to hard drop and instantly kill me. Some of these deaths are frustrating, but the game's mechanics are fun and definitely give me that "One more game" feeling I get from a good puzzle game.

Additionally, the polished mechanics for things like filling in lines with no bombs, unconventionable spin moves for pentomino pieces and such really make it clear that you play your own game, and that you enjoy it. This is I think what sets good puzzle games apart from great puzzle games, and it's clear you're passionate about this and had fun making it. Thanks for sharing it with us!