This game has some serious issues. Blocks aren't staying on the board, the displayed pieces aren't the same as what was shown as the playable piece, the board not being visible, and that's just what I got from play it once.
Like INorth said, the "bugs" are deliberate. The jam's theme was "System Error".
The only real issue is the board being half-visible. Has something to do with browser zooming. Zoom in or out and it should work. Or just download the Windows version. I'll need to look into this.
