Sounds neat! Are you planning on having this mode be entirely separate from the main story, or will you also be incorporating procedural generation in the main story later on?
I'm still not sure, I definitely want to manually craft story maps, roguelite mode is going to be more useful to me for quickly testing enemies and weapons without having to build a whole map around them, I guess I can also experiment with puzzle designs in roguelite rooms first before using them in the story