The following options are not considered properly implemented,
they may improve the game, or make it act strangely - or even become inoperable.
Your preferences will not persist if you reload the page.
Default values are in brackets 
Custom visual settings. This only effects the appearance of the game, and should have no impact on its performance or balance.
The following might improve performance or visual quality.
Or they might not - use at your own risk. Takes effect on new game.
Force Game Over
The following tweaks are for testing purposes only, they can easily make the game unbelievably easy or completely impossible. All setting will take effect on new game, and high score tracking will be disabled.