But there are distant trees on the horizon, so if this was, say, maybe a mile away to appear relatively small, those world have to be many more. That works only work on a flat earth.
Also, the moon and sun appear flattened when near the horizon due to atmospheric distortion.
In recent times I've played Baby Steps, Cocoon, Inside, Slay The Princess, Thank Goodness You're Here, Hyperbolica, Unpacking... Going further back, Unfinished Swan, Untitled Goose Game
I don't think that originality has gone. Maybe it's just easier to churn out shovelware, but there are still new ideas appearing.
Okay then, how about doors? https://lizengland.com/blog/the-door-problem/