StarForge is an ambitious 3d action game that’s currently in development. According to the game’s wiki, it’s inspired by “Halo, Warcraft 3, Borderlands, Terraria, and Minecraft”, and features a number of modes that let players build bases and wage war across randomly-generated alien worlds. Player movement is entirely physics-based and body parts react (somewhat) realistically to every impact.
The first public alpha was released earlier this month and is free-to-play, although you can purchase “Hatch Points” to spend on player models and other assets to use within the game. The developers have warned that this alpha is unoptimized, may have performance issues, and does not include every feature shown in the trailer.
Punch the possum for a fan-made video which explores the alpha in more depth: