LD47 Loop something something

Subscription for LD47.

Ludum Dare page: https://ldjam.com/events/ludum-dare/47/$223139

Press SPACE to place tiles. Try to build [tetrominoes](https://en.wikipedia.org/wiki/Tetromino) built of the same kind of tile. The type and position of the next tile you can place is highlighted behind the player.

The game starts with only one type of tile and adds more as you complete tetrominoes or larger structures
that include tetrominoes. You get the size of the structure squared as points, so 16 points for a tetromino,
25 points for a 5-same-tile structure that includes a tetromino, 36 for a 6-same-tile structure and so on.

You need to place every tile within 10 seconds or it's game over. The time left for the current tile is
shown in the lower right corner.

The sequence of future tiles is shown in the lower left corner.

Some tiles are locked and don't work as part of tetrominoes.

Powerups sometimes appear. Bombs unlock locked tiles, x2 powerups multiply the score for each tetromino blown up afterwards and watches reset the player speed to the initial speed.