Hearth is a remote snow planet where the only warmth is the base you’re stationed in. 
 Under the snow is a network of glacial ice caves linked to the outpost. Use them to flank, to hide or to explore. Some passages loop back to the surface and some go further down. 
 A full day/night cycle turns bright white afternoons into deep blue dusk and dark, cold nights. The weather changes on its own. Blizzards blow in and clear, fog rolls over the ridges, and the snow stops falling the moment you step under a roof. 
 The snowfield is a large open map, but the terrain uses level-of-detail chunks so far-off ground stays cheap to draw. Your view distance stays long and your framerate stays steady. 
 A military base built half into the side of a mountain. The hangars, corridors and command rooms are cut deep into the rock. The landing pads, defences and approach roads sit out in the open snowfields. The fight can move from tight interior hallways to wide, exposed ground without a loading screen.