First of all, have no idea how you managed to arrive there lol.
Two clarifications, since both clearly bothered you:
The cutter enemies can only cut the red edges and your tether (down to half), nothing else in your tree is ever at risk, and what's cut drops back so you can re-collect it. So the "I'll lose everything" fear was the game failing to communicate the threat's limits. Noted. (You can only lose one slot inventory)
The graveyard lever isn't broken, it has a deliberate condition: you need to cut your own hand first. You apparently triggered it without realizing or cutter enemy cut your hand, which is a fair hit on how badly it communicates itself.
One more thing I forgot to mention: you can hold R to rewind a bit, it takes the world back a certain amount.