It's an asteroid-ish game but with ascii characters.
If you wanna make it really challenging you can try using WASD keys to move and ARROW keys to aim, CTRL to shoot (I got to level 2).
But it's sweeter with joystick/gamepad control (button5 or button6 to shoot) (I got to level 14).
at this time i wish i knew how to make it work with raknet(multiplayer chasing would be awesome).