Hi Xeanie, please forgive the late reply, I've been very busy lately with preparing the game for launch and don't get around to itch.io very often.
The patron build (soon to be the full launch version) adds several hours of content & many gameplay, visual & performance improvements for the whole game. Now is your last chance, however, to pick it up in early access before the official Steam launch. Soon (probably within a week), I'll be restructuring the Patreon.
Best,
Nym