So I haven't had much time to play around with this yet but I made a simple rocket after going through the tutorial. It was just a solid booster, the 3-way separator, and then 3 boosters. The problem is that on launch the 3 solid boosters just decided to explode as all 4 engines seemed to go off at once. The 3 solid boosters seemed to be on a different stage than the booster under the capsule so I'm not sure what went wrong. This is an awesome little freeware game. I'd love to see it continue to develop, maybe even into a commercial game. I'd gladly pay for such a game with more features, maybe a moon to get to. Or a spacestation you could build part by part, launch by launch. Perhaps some 'career mode' where your government sets you a budget and increases/decreases it based on reaching targets.