The current goal for the game project is to come up with the first dungeon for the game along with the starting area leading up to it kinda like Kokiri Forest and the Great Deku Tree in Ocarina of Time.
The end result will be a vertical slice showcasing what to expect from the game. Here are some screenshots of the work so far. Keep in mind this is all a work in progress so anything is subject to change.
The mechanics of the first dungeon are beginning to come together too. Below shows the current plan to learn the 3 new spells you get by upgrading the fire rune in the room at the bottom left. You then continue through the path using those 3 new spells to solve puzzles which will take you down a level into the rest of the fire trails. I still need to come up with the puzzles, but there will be additional challenges to challenge your use of the new spells ending with a boss fight.
After the boss fight, you receive what item you need to leave the starting area and complete the rest of the game. It will likely be another rune upgrade that give 3 more spells. The fire trails will have more challenges but you will need to acquire and upgrade the other spell runes before you can continue into the overworld which will be a single large interconnected map that you can cross without loading zones. The map will be 4kmx4km across which is about 3x the size of the entire twilight princess world.