GOG is giving away Dex for free.
All you have to do to add Dex to your collection is go to the GOG website or the game’s product page. You’ll be able to download and play the game whenever you want after claiming it. You obviously need a GOG account to claim the free game.
Dex is a 2D action role-playing game set in a cyberpunk world. It was originally released in 2015. Here is a description of the game from the GOG product page:
Wanted dead by a mysterious and far-reaching organization, you will traverse the futuristic city of Harbor Prime and make unexpected allies on your quest to bring down the system! In this cyberpunk adventure inspired by Blade Runner and Neuromancer, you are free to choose your playstyle: will you be a silent assassin, a hacker, a diplomat or a straightforward gunfighter?
The game giveaway ends in 72 hours, so you should claim it now if you are interested in getting it for free.