absolutely love the game, and i would love to see it expanded - larger upgrade trees, maybe different mines after you pay dads debt? (your character realizes how much money they're making and says "screw it, I'm becoming a full-time miner" or smth like that)
my only (minor) complaint is that the upgrade tree feels pretty zoomed in and it doesn't seem like you can zoom it out - but, with the game's (current) size, that wasn't much of a hindrance anyways