Absolutely excellent work, and on subject matter which is always in demand.  Thanks for making it, and thanks for the generous licensing as well!

These are great, nice work

Much better than mine!  *silently fumes*

This is great. Surt, you are becoming the Paul Erdős of open source pixel art. Just more and more good tilesets to choose from. I hope you don't collapse from exhaustion anytime soon.

Nice work!

And that palette is really tempting me to make some pixel art.

This is perfect for a Drip remake I've been working on.

This screams for some valves and vents ;)

Made a game that uses these for a parallax background: http://github.com/buch415/marble

Hey! Just wanted to say that I used your art in my Ludum Dare entry.

Please feel free to check it out!

http://berathen.com/2013/12/berathen-jam-guide.php

Your art specifically shows up in the 'Hackin Pipes' micro game.

excellent work!!

will be using this for a small prototype, thanks a lot!!

hello

Awesome !!

This is just amezing! Wondefull work

it may be simple but it looks lovely, thanks so much

They're so cool.