I think mostly it was motivation, plus schoolwork. Although schoolwork is already starting to bog down this project, but I'd really like to prevail here, since part of my goal is to actually start trying to wrap my head around coding and programming, and my current partner is assisting me in that respect.
So far, Sirroelivan's still setting up details like the missile explosions and fire animations, just to make the game feel better. I appreciate you reminding me, though, I really need to update the design document. Thanks for your compliment, as well!