Sorry, I think what I meant was elaboration. Polish is important, for example not using the Unity character controller haha, but if you're not an artist like me, then it's hard to find good assets that aren't recognizable.
So obviously the most important thing is the mechanic. At its core, you have a game where you pick a hole at random, hope that you struck gold, and then use the gold to buy things. You should look up Motherlode as a reference, it's basically something similar.
The game is a bit dark, which makes sense, but you only see a flat floor. You could look into using the unity terrain generator to give the floor a bit more depth, or use a normal map on the floor.
Those are just a few thoughts, but I'm definitely a "grind it out and buy shit" kind of player, so your game fits my playstyle :)