Link to the game: https://store.steampowered.com/app/717370/8bit_Invasion/
How to activate the code Steam
1. Start the Steam program. (If you don’t have one, you can download it here: https://store.steampowered.com/about/)
2. Log in.
3. In the top menu, select Games -> Activate via Steam.
4. Accept the terms of the agreement and enter the resulting code.
5. Proceed further according to the instructions and download the activated game.