The presentation is very cool--I love the old-school CRT monitor effect. The controls are solid. The sound design is pleasant, atmospheric and not grating.
Unfortunately, the gameplay doesn't quite have enough variety to sustain interest after a bit. At first we aspire to get the upgrades, but once we have them, the gameplay doesn't continue to evolve.
(Random thought: Boy, am I glad I don't work at Amazon. :/ )