For the Pax 2016 Build of Continuum, to use keyboard controls: Press the K key on your keyboard and you will be able to move around using either the arrow keys or WASD. Shoot is spacebar, and escape is pause.
Press the numerical keys on your keyboard to test out all the different powerups as well. This was kept in for developers to show new people the different powerups available.
An additional note about controls, for anyone else having trouble: I also had to hit K to get the mouse movement controls to work, not just WASD. The mouse buttons seem to work from the get-go, though.
