Bionic Dues is a tactical, turn-based roguelite (roguelike) with a steampunk theme, and is developed by Arcen Games.
The game has an 80% positive rating on Steam, which stands as proof as to how good it is.
Bionic Dues does have Steam Trading Cards, so you can get them and sell it on Steam's Community Market in exchange for Steam Wallet Credit. Bionic Dues normally costs $10, but you can get it for free from Humble Bundle,
Visit this promo page and click on the "Get it free" button. Complete the checkout process, and remember to click on the captcha icon while doing so. Check your registered email id's inbox or stay on the same page for a message which says " Click here for your steam key". Do so and it will display an option to redeem the key, but in fact all it does is just display the Steam Key.
How to activate a game on Steam using a product key:
1. Open the Steam client on your PC.
2. Click on the "+ Add a Game" button, in the bottom left corner of the app.
3. Click on "Activate a Product on Steam", and then on "Next" and "I agree".
4. Copy and past the Steam Key and click on "Next".
5. The game will be added to your library, click on finish to exit the add a game process.
In addition to the Steam Key, Humble Bundle also has a DRM Free version of Bionic Dues, which should be available in your library. You can download it and play it on Linux, Windows or Mac OS X. The game is just a 214 MB download. This offer is only valid until Saturday, January 23rd.