Has been free before and is free again now. If you have missed it thus far (as I have as I did not want to do the actions required for it) here is your chance to get it employing the "usual" Indiegala Giveaway procedure.
http://store.steampowered.com/app/263060/
The usual applies:
How to get the key:
IG has now got some requirements to be fulfilled before you can get the free key. Those are:
Steam account linked to your Indiegala account
Steam account is a member of the IG Steam group
Steam account must be set to public
The procedure to get the key itself has remained the same:
click on Claim Giveaway button
log in to your IG account
do the captcha
click on the "Claim Free Copy" button
do captcha again (if necessary)
claim your key in your IG account (under IG Giveaways).
redeem key in Steam client
Enjoy!
EDIT: The giveaway ended literally 15 minutes after I posted this. Pretty stupid of IG to make giveaways, especially of their own game, end so quickly. I am sure though that they will put this up fairly soon again. I assume their reasoning is to keep people coming back to the site daily to check for new giveaways and then those people also buy games and see their other offers on the site (I assume that is their plan/intention).
Got this during the feb 24 indiegala giveaway.. Game really needs friends playing to be enjoyed.. Feel free to PM me if you are wanting to play, I'm pretty certain I have lysander on my list aswell, but my memory is shit.