I'm writing a text adventure game in Python. The first level is ready to test/play.
Does anyone know how I upload this game to this site as it's written in Python?
Games are usually distributed in an executable format, you can try pyinstaller or pygbag to convert the script into binary files.
If you want to distribute the game as a python script, compress all the necessary files into a .zip and upload it to itch, but you must inform users that it is a script and that they require python installed to be able to run it.