Hey thanks! Its been a while, I can't recall any specific roguelike tutorials other than the ungodly amounts of googling and youtube. RogueBasin has lots of good tips. The lock & key mechanic was definitely the most fun and challenging part to implement, the algorithm is heavily inspired by a game called Lenna's Inception. Have fun with Godot - its a great engine and an absolute joy to make games with. All the best with your project!