Know your audience.
https://itch.io/games/top-sellers
Filter for tags describing your games and see what pricing model similar games used. Scroll down a bit for less famous games that still sell. Unfortunately you do not know at first sight how much promotion those games did. Maybe they have Steam fame or other things. I mean, there is currently a prototype on page 1. But on their devlog they talk about having actual funding, not only the trickle of donatinos on Itch.