This mod will extend (most if not all of) the unused planets in Aground, primarily the solar system ones.
Mercury - has a landable area, some enemies (the magnewyrms will probably be changed), and it is not yet complete. (I plan to possibly add more enemies, perhaps an NPC, and a surprise) It has a variety of ores, including: sulfur, quartz, titanium, and exotic matter. It is a no oxygen planet.
Later on, I plan to add a speed penalty because Mercury is hot. Venus is hotter, so the speed penalty would be there.
Mars - has a landable area, an enemy (rogue rovers), and is also not yet complete. (I plan to possibly add more enemies and a colony [the aliens would have bombed that out also, so it could be more like earth]). As with Mercury, it has a variety of ores, including two new ones, aluminum and magnesium, that are used to make steel-bars (they make a steel-like alloy, so it's close enough). The upper ores on Mars are similar to those on the actual planet, and it includes bands of ice underneath the surface as the real planet also has.
Mercury will possibly be developed in the base game, in which case I will switch it to another system as quickly as I can.
More Mars and Mercury content,
Please let me know of any un-stated bugs and suggestions.
Known issues: Aluminum and Magnesium ores don't have very good icons and the Mars background jumps when the loop is made (i.e. you go from x=384 to x=0 or vise-versa) because the parallax isn't perfect; will fix. It is more noticeable when inside a space ship than outside.
david_maletz for the nice graphics and dwarf planet Mercury is modeled after.
me for bad graphics and code