It's going to need a lot of bug fixing and optimisation. I hope they don't add new features for 6 months before the release so they can finalise the polish.
A Minecraft youtuber I watched also played KSP, I watched a few videos and got the demo. I messed around in it for an hour or so and got the game a few days later.
I like how it has OpenOffice and Chrome logos on the image when they're free software you can download onto (almost) any PC... Clearly designed for people who don't have that big a knowledge of computers, it lists things you can store on a 1TB hard drive.
I suggest the devs spend one month taking in suggestions, and implementing them. These suggestions should be for things which don't take long to implement but add a significant benefit to most players.