Starts out great but eventually if you want to complete side trees it becomes too 'expensive'. I've waited literal days to 'afford' some things and never could. The dinosaur 'side game' is the actual main game but when you level up and uncover a 'glitch' you can only buy a few then you're out of resources again and can't progress that tree. I'm about to uninstall given that I can only progress and not complete.