This is a wonderful game. Good work!
An addition that may be beneficial would be a "Back to Tavern" button, as adding a bunch of floors makes it a bit harder to scroll to exactly the tavern. When the floors higher, like above the stairs, get built, it is kind of hard with the scroll speed to have the whole tavern exactly on the screen. I love the scroll speed, so don't change that! But maybe ease of getting to tavern would be beneficial.