Imagine my game?

My game is going to be about green energy.  I plan on giving a almost blueprint or manual on a certain machine and have the player build it.  There will be a time limit to build it in.  I will also throw in a few different pieces of other machines just to confuse the player.  Then how the player can win is every machine he gets through on the time limit will give him a set of points, and he will need a certain amount of points to get to the next level and then at the very end its a high-score.