You crash landed on mars with the materials to create a couple tunnels and a mine. Rescue is arriving in approximately 3 minutes, but can you survive until then and defend yourself from the incoming asteroids?

Click the buttons in the top middle to change which building is selected and place with left click. Tunnels can be placed anywhere underground connected to other tunnels, buildings can be placed on tunnels as an upgrade, missile launchers can be placed on the surface. Right click to destroy things. 

Press F to change into shoot mode where you can take out asteroids before you have missile launchers to do it for you. Press F again to switch back to building mode.

Press escape to pause and unpause the game.

Notes: 

There are A LOT of bugs that I don't have the time to fix because of the holidays coming up. The rocket launchers are really buggy (You'll see what I mean when you get them), you can leave lone tunnels by destroying connecting tunnels. A lot of other stuff. It will probably be fixed after Christmas since I actually like the project. If you find any more bugs please leave a comment.

I also know the game is horribly balanced, it will be fixed at some point.

Like most of my games, there is no sound.