Space Taxi is an action game. There are 24 different levels, all in sequential order, and the player has to complete all of them.
Space Taxi simulates a flying taxi. The taxi is controlled by four thrusters and has landing gear that can be switched on or off. Switching landing gear on disables the side thrusters, but landing without landing gear destroys the taxi. The taxi also crashes when colliding with the environment, landing with high velocity or not landing properly (i.e. having only one of the gear stands on the platform while having the other in midair).
Source: Wikipedia, "Space Taxi," available under the CC-BY-SA License.