The sound design could use some love and there were no interesting decisions to make. (which is where the depth of idle/clicker games comes from). You simply max out your coin gain and then your era gain because it goes so slow there is no other strategy and it just becomes a chore. I would keep this in mind for these kind of games.
And a godot specific thing: Be aware of focus on buttons, it usually is best to just disable focus entirely, otherwise it just highlights something that doesn’t function as a selection.