It's fun until you get to world 6/7. Progress just stops entirely. There's more worlds to get to, but you can't really get there, the game just ramps difficulty too quickly. It took me maybe a week to get to world 6 and then a number of months to beat it. I spent another couple months trying to get past 7, but never beat it. Uninstalling since I'm tired of seeing it and knowing I can't go any farther.