Disclosure: This game copy was bought by the reviewer. I am not kidding, flashing lights are present!
The campaign took about two hours with the additional missions taking another hour and a half after. The additional missions have a story, but it is separate from the main story in the campaign. This is essentially a RTS about capturing nodes that will allow revealing parts of the map and unlock the resources to construct one of four units. It is straight forward with only two buildings and one resource to gather outside the unit specific ones. While I would call it easy, their is a level of strategy in terms of creating the energy lanes to power bases. You can just zerg rush important nodes to shut off enemy reinforcements and it is actually encouraged.
It is a very short experience (with some decent voice acting, music and visuals), but given the price, the two campaigns are about on par. The only concern is the lack of replay value as missions are pretty straight forward with no real experimentation/deviation.
4