Hello, my name is amoong haha I'm going to talk about this imaginary planet nyan~~
If it's a planet the size of Mars, it's probably a pretty big planet to live in. If the rotation period and revolution period are similar to Earth's, it could have an environment with similar day and night, and seasons. If there is, it must have a slightly lower gravity than Earth. Nyan hehe
In terms of the natural environment, you can have various climates and ecosystems. ~
Plants and animals may also be Earth-like, but it's also possible that species unique to that planet have developed. There may be many creatures that can easily jump high places.
In the case of a satellite of this planet, it may have a moon-like satellite similar to Earth, or it may have a much larger satellite. Nyan~
It's really fun imagining it like this. Nyan~~ Are you working hard on collecting information for the game concept? Go for it and ask any questions you have again nyang~~