Thanks! I didn't know about Landing Confirmed. It looks pretty cool too.
The thrust is constant. With both sides firing it has a 2:1 thrust to weight ratio.
I see, great! I'm having a lot of fun still after many hours on Landing Confirmed. I think the auto generated levels are a great touch. I would add a threshold for collisions, so that under a certain low speed, collisions cost no health. Either that or add landing legs :) You could also easily have different types of vehicles by just varying the thrust and the distance between the two engines. Would make a easy variety being able to pick a spacecraft. Also you can easily make different "planets" by just changing the background color and the gravity value :) and on some planets add an atmosphere of various thickness which adds drag!