Unfortunately, you cannot start on a level that isn’t default, but you certainly can rework your default.
I thought this was a great start of a game! I loved the idea, and your world building is really rich and interesting!
One thing I noticed was the lack of coherency in the overworld. I didn’t know where to go most of the time. This could easily be solved by adding paths; Eldermoor: Gems of Julgar is a great example.
Another aspect I noticed was that you seem to be figuring out tokens. They add a ton to a game, and Koen has a helpful tutorial in the “Help” section. If you ever need help, I’m always happy to!
Great start, and I can’t wait to see where this goes!