2.82/5.00 - If three was no good. Very unrelaxing.
The graphics were decent, but the minimality of the game made it a struggle to stay entertained. The boring gameplay did this as well. The game had about as much depth as a piece of paper (without it's more obscure properties) and the whole "trying to dodge badly collision checked asteroids in minimal detail width a ship that moves like the keyboard is constipated" makes it miserably lame.
I guess with more work it would be okay, but it certainly lacks depth.