This game was intended to convey the feeling of trying to build an escape vessel before the moon could strike the Earth, and featured a transforming gameboard and an upgrade system. Unfortunately, time constraints caused the unifying elements to never quite make it in in time, but some of the transforming aspects remain. The entire gameboard is not available at the start of the game, though the exact key I'll leave for you to discover.
However, when you DO get to the asteroid, you may need to use the nudge controls to get the ball farther along the ramps, as the intended low-gravity, flipperless system never quite made it in in time.
Finally, since the game isn't complete, you'll have to consider it complete once the Build target lights up and you get the ball into the pocket (The game simply resets, at this time.)