No mineable resources, only plant-based resource generation.
Mods introducing new content into the game.
New places to build more factories.
Changes to enemies or entirely new enemies to deal with.
Map generation and terrain modification.
Furnaces, assembling machines, production chains.
Maybe an idea to deepen the research tree a little, the first research unlocks a lot of receipts.
Some things to fix/consider (available recipient but required tech isn't): - Planet/Materials tech (available) needs electronic circuits