The art is pretty nice, and the style feels unified which helps it a lot.
I found the keyboard controls somewhat frustrating; the action you do a lot (confirming selections and placement) is on the return key, which for me is a long way from my natural rest position playing a keyboard game. It's much more natural for me to press space for that, but instead that's the "waste $700M" button which you only want to push occasionally. For me, reversing those two would have helped a lot.
Good marks for innovation, since gamefying a packing problem isn't something I've seen much. Keep up the good work!