Rabbids Coding
I am not sure if its free 2 play forever, because its not on their store
It is an educational game, made to teach kids how to code.
Go to the giveaway page:
https://register.ubisoft.com/rabbids-coding/en-US
Click on PC, Login (its your ubisoft/uplay acc) or Register if you dont have an account, the game will be added to your uplay account