Hiii!
The price will be slightly higher to compensate for the higher fees on the Steam platform (10.99usd). That said, if you are from a country that pays VAT on itch it will be cheaper since on Steam VAT are already in the price.
If you're worried about Steam Keys I'll personally distribute them once I announce the complete release so you should have it before it even releases just be sure to use an email you're still using to pay if you want to preorder it.
I hope I answered all your doubts ! Have a nice day !