i'm glad to see your progress.
What ratio between combat, adventure and other parts of the game are you going for?
How early and how are you're going to playtest things?
Did you consider playtesting your game in a ttrpg mode?
I've recently learned that if not for the licensing issues than early Fallout games would use GURPS for example. There's also Cyberpunk, heavily based on ttrpg. Nothing can replace playtesting, as far as I can see, and this kind of is in many ways very effective and the most human.
I'm very happy with my dive into the ttrpgs' realm and I wonder how early other solo devs can playtest things they're putting into the game. Feedback from players at the table is direct, spontaneous, instant. Sometimes I spend more time taking notes than I've spent playing, but feels worth it.