Score Defense Grid: The Awakening for free via Epic Games Store and keep it forever in your Epic Games Store library. Defense Grid: The Awakening is a tower defense game with lots of enemies and levels.
Instructions:
Go to - https://www.epicgames.com/store/en-US/product/defense-grid/home
1. Login into your Epic Games Store account.
2. Click the "GET" button to add the game to your library.