Ahah, now I have played wall world!...
For about 2 hours and uninstalled. There's not enough to differentiate every run, so they all blend together super quick, it also feel really RNG heavy, one run I did incredibly well cause I got a really good item right away (super drill), the run after I did awful cause I just kept finding small poor cave.
The setting isn't really used for anything that interesting, you could have the exact same game horizontally. And unlike something like Hades, there's no story binding every run together.
Its not bad, but there's so many better options.