there is this purple pink gate thingy and I have seen people go though it, but I can’t. I have litteraly gone through the map 100% all bosses and every gun and upgrade possible thinking it was a door that opens when you do a completion. But since that don’t work is the deep abyss part for patron only? 

Yes, there's a significant amount of content that's exclusive to the Patreon demo, including the area you're referring to. Since Crisis Point is ultimately a paid product, we decided we were happy with the amount of content currently available in the free demo, and the rest will be paid only - either through Patreon while we're developing the game, or by purchasing the game on any storefront once development is finished.