I like those; simple, but definitely well-designed! I just don't get why the normal path from the volcano level seems to take to the castle, but its secret way takes to two levels and then to the castle, so it's a longer path. Maybe I'm just unaware of some sort of bonus though, but if the path that takes to the castle directly is actually a secret shortcut, then I reccomend hiding it.
As for the cave one: why are all level tiles revealed? Also while it kind of looks like the original submap, I don't think it's really much of a big issue. Those edges in the bottom cause cutoff but they're pretty minor too.