I don't know how to upload to the gamejam. Here's a link to my game if this is the only way to view it https://cruelninjaman.itch.io/tetricide

Now that your page is public, you should be able to go to the main page for this game jam and see a "Submit your Project" button next to the timer.

It will open a pop up where you'll be able to see any of your published itch games on a dropdown.

Select your game (tetricide) and hit submit!

Then it'll populate on the entries page after the jam finishes c: