Even if the big gift-giving holiday is over, you’re still in line for a whole bunch of free PC games. Epic’s daily giveaways are still ongoing, and GOG is continuing to provide its regular freebies, too. The latest giveaway is X-Morph: Defense, a combination of tower defence and top-down shooter that puts you in the role of an alien invader.

X-Morph: Defense is currently available for free on GOG – well, free in exchange for signing up for the site’s email list. You can claim it from the store’s front page until December 29, and it’ll remain in your library forever once you do. This is the complete edition of the game, which includes three DLC packs and the soundtrack.

The devs describe X-Morph as a “unique fusion of a top down shooter and tower defense strategy. You are the X-Morph – an alien species that invades Earth to harvest its resources and terraform the surface. Strategize in the build mode by carefully selecting various types of alien towers or throw yourself right into the heat of the battle.”