Thanks for the feedback! We're planning to implement a more thorough tutorial in an update next week when voting is closed. The Engine Power bar is based on a combination of Thrust (% of working machines) and Weight (# of Passengers), so if it starts going down, you can jettison some passengers to slow down its progress or make it start going back up, depending on how many things are broken. Hopefully that will be more clear in the future. Thanks again! This is really helpful to read.