Farworld Pioneers (formerly Outworlder) is a 2D sandbox platformer where players can explore planets by themselves or with their friends. This inaugural title from Igloosoft Games has a lot in common with stuff like Terraria and Starbound — not a surprise considering some ex-Starbound devs are on the team.
Key to the game is its customizability. Building has several improvements, but you can avoid grinding for resources with creative mode. Prefer to just shoot things? Play one of the many upcoming gameplay modes like Capture The Flag or Deathmatch.
Colonies are a factor as well, and the devs promise that the NPCs will actually matter in this game. Once you get that off the ground, you and your colonists can acquire a ship and take to the stars.
From the official website: