I got this game yesterday and played quite a few hours today.
The foundation of the game is really neat! I really feel like Matt Damon in The Martian. I think the single most important feature at this point would be a set of challenges/missions to beat in addition to the quite simple standard mission. Right now there´s no real challenge to the game once you figured out what to do. A few ideas on the top of my head:
-Advanced mission: Survive longer with fewer resources on the map.
-Escape: Find your way to an escape pod located quite far away.
-Colonist: Start game with seeds and some food, no plants available in the wild. Build green houses.
-Power it up: Provide power to a far away research station (make it impossible to build generators close to it)
Other random ideas: I´d like to see a power/fuel level on the buggy to limit how far you can go. Corresponding to oxygen level, so you need to return to recharge it. It would also be cool with a bigger, slower buggy with it´s own storage unit. I´d also like to have a module that produces water so you can be fully self supportive.
I think this game has great potential, hope you continue to develop it!