https://store.steampowered.com/app/1016180/Terror_of_Hemasaurus/

A retro city smash 'em up with satisfying destruction physics.
Play as a Giant Monster unleashing terror upon mankind in this modern arcade experience with the action turned up to eleven.

Activating the steam key

1) You must download and install Steam http://steampowered.com/download/SteamInstall.msi (if not already installed).
2) Create a new account on Steam or go to an existing one.
3) Select "Activate via Steam ..." in the "My Games" section, and enter the key received after payment.
4) After activation, the game will appear in your list of games and you can install it.

Please leave feedback after successful activation of the game.