Space Taxi 2
In this game, like the original, you pick up passengers and drop them at the requested pads or take them out of the level to the next. In this game, however, you also have bonuses that float up on balloons like more fuel, better fuel efficiency, spare cabs, money, cab repairs, etc. Your passengers also vary like humans (male, female, old), aliens, robots, etc. There are 30 levels total spread out over 3 planets.
Some levels have weather conditions and every level has a secret bonus hidden somewhere.