In order to get your free Steam key, you need to
- Login, or register a new account, at IGN.com
- Visit Keys page and press "Get Key" button at Drone Strike Force giveaway section
The Steam key is activating as "ODD for Beta Testing" but according to the message from Odisi Games (game creators) staff on official Discord channel, it's a full game with a bad label that won't dissapear from the library (pic). Enjoy!