Kind of amazed that a search for a full save/unlock/cheats is just a bunch of people asking and nobody posting. Did people just give up on that after .52 or something?
Search bloat is what happens when people ask too often and seek too little, to the point where it becomes unsearchable for those who try.
1) There is a 1.06 build with cheats, but it's not the one being modded for right now. I think there's a 1.07 build too.
2) Full unlock? The game comes with saves in its most common distributions and they have mostly every item. Unless yhou meant gallery, that comes as unlocked as it can, too.
Build 0.52 hung around the longest. The game jumped to 1.0x versions with not much more added but at least the game was completed level and boss wise. Modders do the rest, and the game's dev admitted that the version of Unity he used was so archaic that the game would need a full rebuild to revisit. He didn't mention that he also used an archaic version of spine for his animations, barring most would-be modders from trying to work on art for the game.
It's a nice game and I'm grateful for what the modders were able to enhance, but it'll never really be complete unfortunately.