This game has some solid potential. The ideas and presentation are very solid. I think there’s some balance issues in the game, though.
I think the player should start with a little more money than just $5. Being able to put out only a single turret isn’t really enough, even in the opening part of the game. The station does not have that much health, the laser doesn’t do that much damage, and it can’t cover enough space, even with control over the spin of the rings.
The best I was ever able to manage was three lasers on the outer ring before the station was destroyed, simply because I couldn’t get the ring to spin fast enough.
There was a point where I was able to do better than that, but it was because there seemed to be a bug where the game did not end after the station’s health hit -1. At one point, the screen was almost filled with asteroids all exploding on the station, but it sat at -1. I had plenty of money at that point, though.
Over all, I think this game could be really enjoyable, but I think there needs to be a better balance between money, asteroids, and station health, in my humble opinion. Still… great work for two days! :D