After successfully beating one game, I can safely say this is among the best 4x games I have ever played, it truly is a diamond in the rough. Unfortunately, when I play on a map with a large number of hexes, computational time can become excessively long. This is essentially my one major gripe with the game. The turn times become unbearable at normal or large planets. I feel that this problem could become somewhat remedied if one could have more control over planet generation for small planets. If you want to have a map with a relatively short turn time, then you must go for planets that are within the 0.15 to 0.35g range. The problem with this though is that planet choice essentially limits the biosphere, atmosphere and general setting for the game. If the user was allowed to have small maps that possessed the physical characteristics of larger maps, albeit with less hexes, then the game could be significantly improved.
Essentially what I am asking for is an option to disconnect the number of hexes from the actual size of the planet for computational time's sake. If this was the case, one could have the characteristics of a planet in the 0.75G to 1.25G range, while still having the number of hexes seen on a planet in the 0.25G to 0.4G range. Presumably, this could reduce computational load s well.
I also made already request for all the traits that have effect in the planet generation to be made enforceable before generation, as I think that currently making a specific kind of planet you want to play takes absolutely too much time.
Why are you by the way comparing planets by their surface gravity (g)? Mercury and Mars have quite different sizes and masses, but Mercury has still higher surface gravity thanks for its much higher density. As far as I know, total mass of the planet and tectonic activity are the deciding factor for most of their other traits like atmospheric density and habitability (if positioned on the systems life-zone).