i have a question- If ive already bought the game, will it allow me to access further updates automatically- of not, How am I able to download them when theyre released?
If you've bought the game on Itch.io, you will be able to access all future updates, yes! If you're using their app (just called Itch), all updates should be downloaded automatically? I don't use the app so I don't want to make any promises, but I believe they try to keep it as simple as possible. If it's not automatic, updating should still be pretty easy.
If you're using the website, you can go to the "My Library" section (go to the front page of the site and there'll be a dropdown menu for all your account stuff) and just choose to download the game again after the new version releases.