Lucky. I literally was caught off guard when I realized that the u/second counter for the "Descent" variable could go up, at a fast rate too. At that point it was already too late.
I think someone (who has the capacity and brain to make it) should make a fully fledged Spaceflight Simulator. Kind of like Kerbal Space Program or Spaceflight Simulator (A mobile game in case you are wondering) but 2D...and...yeah. I think you understand.