And if the tower price is less than 10 and you press Delete, you get 10 coins, so if you do that many times, you get unlimited coins. It should be 50% of the tower price, not 10. Also, you should be able to change the upgrade price, I don't want it to be 10.
There is a shortcut in Hat Factory. Break the Crumbling Rock instead of going the way with moving blocks, then keep holding the left arrow key. You will be near the goal.