There's one of those online IDE services that actually supports Python with Pygame (can't remember which), but dunno if it lets you embed a game in another site. Just offer the game for download.
Probably by uploading an index.html that only contains an iframe. But that's iffy. Do you know if the folks at repl.it approve of embedding? The game is running on their server after all.
Google Colab does not accept iframes either. So that also falls away. Well then it will be very difficult. I just have to somehow get python to work with html. Then I can upload the html file. Otherwise I don't know how to upload python games to itch io.
As downloadable files. Really. Guess making a native web port is an option too, if you're into that. But a lot of people prefer to play offline anyway, and to actually have the game. Don't worry about it. :)
