As usual, the bundle is tiered. Any sort of contribution allows you access to the first tier of games, of which there are three. Giving more than the average contribution (which, as of now, is $5.35) will give you the second tier of three games. A contribution of at least ten dollars will give you the seventh and final game. The bundle will be available until Wednesday morning.

Tier One

Steam Marines: A 2D top-down squad-based game that takes place in a steampunk spaceship. 

ROCKETSROCKETSROCKETS: A game which stars two to four rockets fighting against each other. The rockets fire rockets with hopes of hitting other rockets. Hence the name.

StarMade: A 3D sandbox game that is still under development, but which you’ll get early access to. It takes place in space and gives a whole new meaning to “open-world.”

Tier Two

Interplanetary: An interplanetary turn-based strategy game that lets you live out all your dreams of space-themed artillery battles.

Starwhal: A multiplayer game that involves using one space narwhal’s tusk to hit another space narwhal in the heart.

Edge of Space: A Steam Early Access game that finds you waking up on a spaceship that’s gone way off course. Your emergency landing will take you to a world where everything wants to kill you.

Tier Three

Reassembly: This top-down, omnidirectional spaceship shooter plays a bit like Geometry Wars without the barriers. It has a deep ship customization system that gets more complicated as the game goes on.

For just $10, Humble Bundle is offering these $89 worth of games. So why have some people paid as much as $125? Because, while some of the money goes to the developers, a portion also goes to one of two science-based charities. This is your chance to explore virtual space while helping people discover more about real space. Over 33,000 bundles have already been sold.