So, the project didnt advance much during the last month, I was distracted by games and other stuff, but i'm still working on it, i guess i'm just spending too much time on details... >_<
Recently, i've been working on the furnace buildings, at first i planned to have only one type of furnace at tech lvl 1 (the arc furnace), but as i researched more into the subject, i realised that an arc funace can't really smelt iron ore, so I spent several hours looking up blast furnaces, and now i have numbers for the input/output of those in terms of in-game ressources.
One thing that i like, is that, surprisingly, a blast furnace can work by using only lvl 1 ressources : Oxygen, Carbon, Carbonate (and Iron Ore). The ressource that i call "Carbonate" is really Calcium Carbonate, and it's also used in making Carbon, Concrete and Glass. In DF terms, it's Limestone, basically.
My only problem with calcium carbonate is that it seems to be a byproduct of organic life, which doesnt make much sense if you're colonizing a desert world, but it's too useful for me to not use it.
So yeah, slow progress for now, mostly crunching numbers for the buildings costs and productions but i really want to get an alpha version out as soon as possible so i'll keep at it, even if it feels like a snail pace.
Two other things, the first one is that i somewhat like learning new things (like "how does a blast furnace works"), and i sure learn a lot when i'm working on this game, and the second one is that i'm thinking about including the "pollution" from industries into the terraformation aspect of the game (which won't be in the first release though). Basically, i plan to let the player influence the atmosphere contents with dedicated terraforming facilities, and when i read about the blast furnace and it's CO2 output, i thought it would be cool to have it add to the process. (I just made a quick calculation, it seems that one would need to smelt several hundred billion tons of iron to make a terraforming-class change in the atmosphere of my planets).