A short in-game tutorial will teach you the basics.
You are in control of an Ultranought which can build several kinds of ships. The ships can be both used to keep enemy fleets away from your Ultranought and to attack the enemy base.
Building ships requires a number of ship frames - your Ultranought will be producing these. There are also optional upgrades to improve your ships.
The Ultranought is of course not defenseless and can deal plenty of damage.
Various upgrades are available to improve your Ultranought during battle.
Every defeated opponent will reward a skill point as well.
Shortcuts during combat :
1-4 open ship bays (or start building them)
5-8 activate actions
ctrl+click the bays to start autobuilding
enter or space = build the ship in the active shipbay
p = pauze
f = speed up