Thanks for the feedback. I’ll look into the spawner/movement bug.
The map is randomly generated when you start the game, so erasing your save in some way (such as clearing browser cache) would result in a different map. Assuming you are familiar with Minecraft or other such games, there are still biomes that are used in generation and in each biome there are unique encounters, such as the Delta that you noticed. Pyramids can be particularly troublesome if you don’t like solving mazes.