Working on a flying attack craft (Dune map) that fires a salvo of projectiles from the edge of visibility, then flies over the player. You can shoot it down. The today's Beta build is very raw and for testing only - not playable yet. Expect lots of polish as it matures.
To access Beta, right-click Alien Grounds → Properties → Betas → enter password aliengrounds
Select the Beta branch from the drop down menu.
For the stable version, select Properties → Betas → None