Humble Bundle has been the purveyours of cool bundles for games (and software and comics). But they also have a publishing arm, publishing indie games under the “Presented By Humble Bundle” tag.
They have since rebrand the publisher name to the simpler Humble Games. To celebrate that, Humble Games is offering a free game under they published: Aegis Defenders.
Aegis Defenders is a 2D tower defense game where you get to control characters directly and swtich between them on-the-go.
You can grab the game here. Just login and subscribe to Humble Bundle’s newsletter and you’ll get an email with the Steam key.