MC2 should have some sort of physics built in to make it more fun.
Here are some ideas for MC2 physics:
Gravity: every planet has gravity, and depending on the strength of gravity certain things become easier/harder. For example, walking uphill is a breeze in low gravity, but a pain with high gravity. Also gravity allows rovers and other objects to fall if they go off a cliff, which would add an extra challenge for players .
Erosion: if a planet has wind or water, erosion will occur. For MC2 this means that blocks around moving water or in high winds will dissappear, simulating erosion.
Material strength: in real life different materials have different strengths and weakness, and this should be reflected in game. For example, a rover made out of steel should last longer than a wooden rover, and a titanium rover should last longer than a steel one.
This is all I have for now, but I'm sure there is room for more ideas. I will post part 2 if I get enough new ideas .