Here are somethings that I think would improve the gameplay and world building.
Waterfalls and springs: ideally waterfalls would flow into major waterfalls sources While springs would flow up to a specified block distance. Code wise it would look like and inflow command and outflow at the distance/water collision.
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Fantasy setting - essentially magic, imbuing items, mythical creatures like dragon, unicorns, krakens and other monsters would be activated. Training to ride even some of these creatures.
Other races would be available as well
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Third person camera
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Dungeon builder- essentially if there are a bunch of prefabs there would be a creative world that starts with an entrance type(ruins, cave, etc) and modularity build in a flying view the map of the dungeon.
Toggling being able walk through and place details and check points.
Essentially it would be an interactive blueprint build that would/could be saved as an “as-built” dungeon versus a seed build.
A seed dungeon build utilizes prefabs and randomized layouts, levels, and depth with a check for sun light script to avoid accidental mountain/hill visual errors penetrating above ground.
These are a few things and I will post more as I think of them.