Humble Thanks for the positive feedback.
it's best to zoom in (via mouse wheel) to select units via left click. You can keep CTRL pressed to select multiple units. To give move commands right click and to set multiple waypoints keep CTRL pressed. First thing is to collect scrap (by sending the mech over scrap and then sending it back to base). We have a longer guide on the main page of the game, sadly we ran out of time to add the tutorial.