Ok, I like the art style, but I definitely think this needs some more polishing. I think adjusting how fast the asteroids fly at you OR adjusting the speed of the spaceships would make it a lot easier/fun to play.
I think a cool idea is would be instead of controlling both spaceships with WASD and <>^↓, maybe just have one spaceship on top, and one on, the bottom and your WASD controls both of them but invertedly. So when you move one up, the other moves down? That might add some challenge/depth to the game. And of course it's just an idea, not saying the game NEEDS this xD
But definitely not bad, good work!