I really liked the art style and concept of the game! The money did make the game very easy but ignoring it and earning it as intended made the experience better. I would say add more to do as after I finished the first floor I didn't really need to mash to earn 10 dollars as the counter went up fast enough to upgrade to the next button so I spent most of my time standing by the next button for a maximum of about a minute each.
Maybe add a mechanic where certain employees will stop working and you need to keep track of the floors or the money flow will slow to a halt.