I had fun for a bit and I think there is great potential here. I think a lot of programming pain went into that!
Now, I don't understand the difference between the blue and red skyhooks. Sometimes I clicked a red skyhook and then the game wouldn't let me place any rockets any more, and the red cursor on the planet surface wouldn't show. I had to restart the game.
Speaking of the red cursor on the planet, the circular hitbox around the planet that allows for placement of rocket is very small. Make it so that the planet itself is part of that hitbox.
The big red targets in space where impossible to aim at for me, it was completely random using the blue skyhooks if one of the hooks would decide to launch a rocket in that direction.
Like other people have said, I think we need to be familiarised with the mechanics more slowly and carefully. A few screens of explanatory text won't do it as a tutorial, I think it needs a proper step-by-step tutorial level.