Oh I knew that profile pic was familiar, I remember your game from Dungeon crawler jam 2023, nice to see you again.
Thanks a lot for the detailed review and for the thorough exploration. The deeper floor indeed gave more money but we neglected to display that. In an effort to make the UI as minimalist as possible we ended up confusing everyone. The same goes for the speed upgrade, it was nerfed quite a bit because it made the game look bad when the pickaxe swung too fast, now it mostly reduce the cooldown between swings and the knockback from hitting blocks.
The gold placement system is simple but pretty intentional, gold blocks will usually spawn on cave walls or in small cluster to make them more pleasant to find. I'm really glad that someone noticed.
Thanks again for playing, I'll be sure to come check your game when I get some time.