YOU'RE PLAYING: Crimson Warfare Game.
Use the WASD keys to select buildings, press space to select the base.
When the game begins, first highlight / select any of the building sites and choose which building to construct. Certain buildings need to be built to make other buildings availible.
Units / Upgrades / Weapons.
Each building has different properties, deploying troops, researching upgrades, etc. Click on the building you want to use to see its availible options. You gain money every few seconds, the more income, the more money gained.