This game suffers from lack of feedback and affordance. For example, while "pumping" a tree and collecting money from it, the player has no indication of how much money they have until they move to a different menu entirely. Before money started growing, it was unclear to me whether I was supposed to hammer a button or something to make the tree develop faster. I found the control scheme somewhat unnatural, as I needed to move my hand back and forth between the arrow keys and other portions of the keyboard to navigate menus.
For the most part, this game adheres to the necessary design constraints, but some animations (notably water drips and progress bars) are not pixel-aligned, breaking the illusion of an 84x48 screen.