The price says free but there's no way to "claim" this. There is no download link whatsoever. Even when you click on the "download or claim button, seems like it's broken.
A downloadable game for Windows
This is a game about killing the Enemy bots that want to destroy Humanity.
Make sure to check out the patreon
In order to download this game you must purchase it at or above the minimum price of £10 GBP. You will get access to the following files: