This game has more replay value than any game I've played before. Not it only does it demonstrate the physics of orbital flight, it also illustrates the need for careful and considered expenditure of fuel.
If I was trapped on a desert island with one game, this would be it.
I'd suggest
* Adding a + / - to the time slider. Often just 2x or 3x is desired and having to either momentarily jump to 10x while trying to use the slider is problematic, and having to pause first to avoid this jump is a pain.
* Offering faster time-advance than 60x. sometimes it's fun to watch the lander zip around if you've botched the docking.
* Option to set the orbit trail length.
* Projected path option.
* A guide. Some things I didn't understand at first, but had to figure out, and some things I still don't understand.
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screwgravity
Sipank
bodhisoma