Show HN: 2etris – the most elegant 2 player Tetris variant (2etris.com)

Hey all! I actually made this years ago and never shared it because whenever I was about to, I'd always discover one little thing that I wanted to change.

Anyway, it's a Tetris variant where one player's negative space is another's positive space. You'll need two people to play it. Please let me know if you find any bugs!