Mono is a downloadable Windows game that is described as 'one part Asteroids, one part Robotron, and one part Paint Shop Pro'. Created by the talented guys over at Binary Zoo, you play as a plucky yet resourceful circular object set on changing its surroundings from black to white (or white to black, depending on mode). You accomplish this by destroying colored circles (red, green, or blue) which split in classic asteroid fashion. Upon destruction, they leave behind some of their coloring, assisting you in your goal. In addition, you can pick up power-ups to further help in your quest (pro tip: stars improve your weapons). Coupled with three difficulty modes, and the ability to import your own music, this is a well designed little game.
Analysis: There's not a whole lot more to say about this game. There are no bosses or fancy graphics, and it doesn't need them. It's a testament to what a couple guys with some creativity and talent can put together. The only real weakness is the lack of in-game tutorials, but as the controls are simple, it doesn't really need it. Just use the mouse to move and the right button to change the direction of fire.
The other downside is that a download is necessary to play, and it does require the latest directX as well. It's a pity that there is no browser based version, but if you can overcome these obstacles, then you will find yourself rewarded with a game experience that is both simple and oddly addicting. Click, then scroll downward to try it out.