maybe you could put in commercials like, let's say you finish the first half of the battle of the enemies for the macintosh Voices.
and microsoft sam would say we will be back after this, and the game would pause.
perhaps you could put in more items that have to do with earning for bits and such.
and then the stage would have more and more levels until you get to the final boss of having to fight alex again.
how does that sound?