Worker
Workers are your main tool for gathering crystals.
You harvest crystals by placing them on Fountains by clicking on the fountains on the Map
See also: Worker View
Create and upgrade workers
You create workers of your type (color) by spawning them from your Worker Spawner . You do this in the Worker View. If the level of the Worker Spawner is higher than 1 you have a chance to get a higher levelled worker.
You may merge two workers of the same level to a higher levelled worker, but no higher then the level of your Worker Spawner.
Workers of other types (in other colors)
You need Worker Modulator to modulate workers to other types (colors). Then you may select "Modulate Worker" in the Worker View on an idle worker to modulate it to that colors.
The level of the Worker Modulator limit how many workers you may have of that color. You may have any number of workers of your type (in your color).
Other things to do with workers
When you have a Worker To Transmitter Parts Transformer you may transform the worker into parts used for mounting a transmitter. The type (color) and level of the worker affects what you get, but some random is involved too.