I want to like this game, I really do, but it starts out the gate with a high difficulty and doesn't let up from there. In the second level, where I'm still not sure exactly what the controls do, still not entirely comfortable with the mechanics--you make me have to deal with trying to maneuver through entrances barely bigger than the "taxi". That's too steep a difficulty spike too quickly.
Why is the health meter even there? It's difficult enough to maneuver and deal with the time limit. It feels tacked on to make an already difficult game needlessly more so.