So I just bought the game and purchase went through, not sure where to download the game at. lol.
After purchasing you will get an email with your Steam key. But you can always check your key at the Account Settings - History.
How and where you can activate your game key? Link: https://neocoregames.com/en/community/activating-a-product-on-steam
you get emailed a code to use in steam - why is this such a common question xD
To be more specific click on "games" up at the top of Steam and then choose "activate a product on Steam" from the drop down menu.