There are many games and simulations based on the first moon landing so here is mine. 
This version is true to Newton’s laws of motion and uses the actual masses and fuel loads for the base and return capsule. All other variables are fictitious and chosen to make the game playable although is very challenging.
If you just want to see a safe landing then start the game and choose auto-pilot mode, it takes nearly 4 minutes to land but you can speed things to 10X with the time scale setting.
The full sketch code is available on OpenProcessing and p5js web editor