Honestly, one of the best jam game I have played yet. A great interpretation of the theme, good execution. I found the controls of the rover really correct. The marker system is great too.
The constant sound of the rover's engine (I think it's that?) was a bit annoying, and maybe calm ambiance music would have been cool to add too (however it was also very good without).
A post-jam version with maybe more planets, different hazards, limited markers that you can pick up, could be really interesting. Great job!