For Ludum Dare #26, having the theme 'Minimalism', I made a game that I call 'And Then There Were None'.
It's a puzzle game where you have to make all the colored blocks disappear.
Blocks with the same symbol, but opposing colors (i.e. red vs. green or yellow vs. blue) cancel out when you push them against each other.
Blocks with different symbols have different effects when pushing against them.
Your cursor's color determines which color blocks you can move. Beware, it usually sticks to the block that you are moving. Moving your cursor over a dot will change its color.
Download it from my dropbox.