The game is 2 player, both players use the same computer. When one player gets to the right hand edge of the board, the board shifts left and eats the leftmost row.
If a player is in the leftmost row when it is eaten, that player loses the game.

Keys:

Player 1 move: WASD
Player 1 flip square in facing direction:caps lock
Player 2 move: arrow keys
Player 2 flip square in facing direction: enter

Collision rules:

You can only move to a square that is either white or your color.
All players can always go through white squares.
All players can always not go through black squares.
Blasting rules:

You can blast squares of your opponent's color.
You cannot blast black or white squares.
You cannot blast "permanent" squares of your opponent's color.
Movement rules:

you can move up, down, left, or right.
you cannot move diagonally.
You can either blast or move, but not both at same time.
When one player gets to the right hand edge of the board, the board shifts left and eats the leftmost row.
If a player is in the leftmost row when it is eaten, that player loses the game.