It was a fun game, but I have a few small things to point out. After getting some upgrades, it was easy to earn 100k gold coins in just a few minutes, but earning money was still a pain. It would be nice to have a few more upgrades, especially ones related to money, and more uses for the gold coins.
Overall: I finished the game, and it was fun! I also agree that the game could use some sound effects. Sometimes the game also got stuck on a black screen after pressing Save and Exit, and I had to reload the game.