Hey Densch, Looks like you've basically completed the DEMO 100%, basically after the Oblivion Area and after you get Daisy that's where the Demo ends, I leave it off like this because now there are 3 different ways to go, 2 of which will be accessible right away. The area you were talking about after proving yourself to the void will be accessible after getting the double jump or wall jump which is obviously not in the demo yet. Ill also just let you know now that the next place to go after this will not be down, Responding to your earlier comment about how it currently feels like your going down with no backtracking. I want the player to after they get Daisy, to start heading back and exploring places that they couldn't go before that they can now, this is when I am kinda letting go and letting the player do their own thing.
It makes me very happy to see how much you played the game! I will listen to your feedback and improve the game with it especially on that dark park. As of right now the Runes are useless but they will be used on the Magic Anvil to upgrade and combine spells, which I don't have implemented as of yet but will be in next DEMO.
To answer your question about how complete the game is, I would say I'm 75% done with main mechanics, and than 25% done with world building if that.
I plan to spend about another 1 to 2 years on this project but I will be keeping update on my social medias so make sure to follow those, YouTube is in my itch page, and Instagram is @lemonramengames Thanks for playing my Game Densch!