Let's go about getting more 2D sandbox games onto steam.

Ooh interesting I used to have the old version of Junk Jack on my ipod back when I used that thing. Pretty decent, but never really got far. Am interested in following the PC version of Junk Jack X, thanks for pointing out that its coming to pc @stuart98 .

So closed alpha tests are underway and I can't tell you much but what I can tell you is that things are awesome.

A few people got in after I did so it seems like they're open to selecting more testers.
https://pixbits.wordpress.com/2016/02/22/junk-jack-closed-testing-recruitment-begins/

Factorio! Get it! Now!

http://store.steampowered.com/app/427520/

2D overview game. Basically an amazing tycoon game with cool visuals. The visual style very reminiscent of the original Fallout and Total Annihilation. Though a better colour scheme than the latter.

Can't wait for rimworld to release on steam.
http://rimworldgame.com/