I only once encountered a bug that made the launch angle not vary during the Earth mission, which fixed itself when I went to the main menu and re-selected Earth. And I appreciate the fact that it has multiple types of games instead of just one. But it simply isn't very entertaining. The only controls with the launch game were to click to set the angle and power, and you had no control beyond that during the flight and nothing to do except watch the rocket fly in an arc. The Ice Planet missions were the most enjoyable of the three, but suffered because of the inertialess stop and quick drop if you release the mouse button. (The solution to which is: don't release the mouse button, but it was irritating until I figured out that's how you need to play it and was irritating playing it that way instead of clicking once to start and then having the engines stay on until the end.) Overall the game seemed like more of a chore than fun -- it's based on rudimentary game engine mechanics without a story or a sense of exploration or strategy or upgrades as you progress, and has lackluster graphics with no music.