I'm disappointed in it too. I didn't really go in expecting anything much, because I try to keep an open mind. But this was just ... eh.

Killing the same mobs over and over again in boring, samey environments just doesn't appeal to me. Particularly when the dev's patented quadruple-lock rng system prevents you from getting anything worthwhile for up to 3 hours of playtime! =D

Seriously. Layer 1 of rng - will a chest spawn?
Layer 2 - Will it explode?
Layer 3 - Will it be weapon or armour?
Layer 4 - Will it work or just flat-out say "nope, no upgrade for you"?

That last layer is just cruelty tbh. If your item is below the floor you are on, it should upgrade 100%. Full stop. Grinding for hours and getting nothing back is not fun when the content itself is lifeless.