Speed of life and death(Bug fix v1)

Changelog: fixed the bug of score. Now the score is 0 when the game fails and at least 1 when it wins. It may not be a very interesting game, but it still took me several days, especially the train. You are an engineer on the troop transport train, but you find that the driver died suddenly. You must rush to the cab to stop the train before the train hits the wall. The score shows the distance from the locomotive to the wall. Attention: 1. After arriving at the cab, pull up the pull rod "X" to brake. 2. You must stop the train for two seconds to win. This is essentially a parkour game.