Basically, more content like being able to generate biomass from gravel, simple and complex polymer for crafting and more rocketlaunchers with specialised rockets like rapidfire small ones with spread intended as a kind of flare for the stronger and slower rockets and torpedoes.
also some armor made from girders and plastic, heavier than light armor but lighter than heavy armor and also alot cheaper (not all armor block variants are in it yet though and the selection is a bit buggy but the standart 1x1 blocks are in there)
also theres an assembler just for ammunition, 4x faster than the normal assembler aswell as a chemistry lab which makes biomass processing faster.

What's the difference that makes this mod "complex" ?