A New Zero is a nice little online shooter-sim, currently available as a free beta. The purpose of the game is to destroy the enemy's base by boat or plane, using missiles, bombs or cannons. And that's it, really.
The minimalist visuals provide a kind of Tron-era-atmosphere, with units made of basic geometric shapes and subject to bizarre in-game physics.
The location for your fighting is functional and beautiful as well: A square on an endless sea, the sky a linear gradient and the sun a circle that rises and falls as the day progresses. It's like 80's retro meets network gaming inside a bubble of zen-like tranquility.Best of all, you only need to download a 900 KB installer - the game itself fits into one 432 KB executable.