It is year 3025, after the climate disaster the Earth became a floating snowball.
Also aliens invaded... so yeah. 
In this prototype you can build armored sleds and fight off aliens.

Controls
Movement - W/A/S/D/Space/Shift
Fire - Left Mouse Button
Build mode - B
Rotate camera in build mode - Right Mouse Button (hold)
Change tools - 1/2/3/4
Zoom in/out - Scroll/+/-
Reset position - Backspace
Restart - Backspace (hold)
Pause - Esc/P
Spawn enemies in sandbox - Enter

Credits
Models and code by me, Sounds from Soniss