The free-to-play games.
You can die because of two reasons. Either you loose your energy due to heavy damage through enemies or surrounding elements, or you run out of fuel. Your goal is to get through the levels as unharmed as possible. The damage you take through your surroundings are heavily influenced by your current velocity. Notice that there are several power-ups to restore fuel or energy or to reload your guns. You can use the guns to fight enemies or to remove some obstacles from the environment.