My name is Rocco Balsamo and I run the website simmer.io.
SIMMER is a place for Unity Developers to share WebGL games. We've been around since 2017, and pride ourselves on being the absolute easiest way to share games on the web. Instead of requiring long and confusing forms and packaging instructions, we aim for simplicity.
To share a game on our site, you export your Unity game to WebGL and then simply drag the export folder onto our upload page. (No need to even zip the folder!). From there you can fill out a few details, and click "submit".
I really respect Itch.io and it's founder, Leaf. It truly is a great platform and was absolutely revolutionary when it first started. I remember reading that Itch basically forced Steam's hand to accept more games from Indie developers like yourselves.
I encourage you to come and check out our site, even if you have already shared your game here. It's always important to get your content out there to as many places as possible so that it can be found!
-Rocco