Silica Basics
Build Bio Cache near the green circles with a dripping rock in them. These are your resource gathering points. They eventually run out. Shrimp will go from the nearest Bio Cache to the nearest dripping rock and look for a new one once it runs out.
Shrimps will auto gather if left on their own and will defend if needed (they also wont just ignore enemies that are within aggro range)
Build Nodes in a chain towards other resource points so you have access to more resources more quickly.
As your economy grows, build more spawning pools so you can pump units out faster. You can que up multiple units.
Build a Quantum Cortex and upgrade it when you have the resources. This will unlock new units and buildings.
The AI is super dumb and there is no attack command that I can find. So if there are enemies about just make sure your units are close enough to them to aggro.
You can build new hives as you tech up. This doesnt seem to give you anything other than a bigger building area than a node and a second HQ if your first blows up.