I have thought about this some more, and decided to put up the early access version when I have a more stable build available. At the moment, I'm doing a lot of tweaks to the game and updating it almost daily, and I feel it's better to only host the game on steam at the moment. I can't really answer when I'll put up a version on itch, but it will likely not happen for 2-3 months at least.
Sorry for being unclear, I'll change the description to reflect this!