No, it's also free on here if you click all the way through and leave the donation amount as $0.00. I have it here on Itch to try to reach a wider audience.
When you click on the "Download Now" button, you should prompted with this message:
"This game is free but the developer accepts your support by letting you pay what you think is fair for the game."
"No thanks, just take me to the downloads"
If you click on the "No thanks, just take me to the downloads" button, it will allow you to download the game for free, same as on Steam.