Buying it just the once gives you access to all the updates :)
thank you and just so you know it is not an option to pay via card only paypal
Unfortunately not up to me, that's on itch
You should have an option to just use PayPal as a card processor once you're taken to their site. Something like "pay with credit/debit card" below the login dialog.
I have stripe set up so you should just be able to use cards on itch
