How to download? Just click the "Download Now" button.
How to battle? Use W to activate thrust, and 1-9 to fire. Alternatively you can click the tabs at the bottom of your screen.
How to build? Select items in the inventory using left click. Place items using Left click. Delete items using Right click.
How to get good?Join the discord here! I'm more than happy to help you even more there!
Above all, have fun while playing. Cheers!