EDIT: They have added a lot of ways to watch ads, but that's about it. Uninstalled. Fun, but gets boring quick. Needs a lot of refinement. Once you've beat all the levels it is impossible to get enough gold to do high end upgrades without spending money or literal hours each day grinding the exact same thing over and over. There is a "weekly" challenge, but it doesn't appear to actually end. No idea what they were going for there.