Without an ability to turn, this gets pretty difficult after level 1. I was able to get one of my spaceships in the second goal, and trying to turn of the thrusters so I perfectly landed in the goal and didn't hit the asteroids was a fun little moment as my ship launched around the screen at mach 10. I think if the asteroids would be more fun if they damaged your ship and maybe broke a couple of thrusters or something so that the ship spun around when you turned it, that could add some fun micromanagement to the game where each of your ships start acting in their own distinct ways before getting destroyed.