Hello, I forgot to add my result here after I finished this section, so here it is a little bit later. :]
I managed to complete the design I set out to do with wilderness, a shack area, a courtyard, and a mansion with three floors. It has full UI, SFX, Music, various props, and different enemies (mostly from the Unity store).
I also added notes with some lore/story (6 in total).
It is too big for WebGL version, so you can download the build here.
I’ll leave here some screenshots as well: