I've played Clicker Heroes earlier, however it got repitive after some time. All you can do is reset, reset and reset. However, they recently got an update with upgradable equipment and mercenaries. Maybe I will pay another visit.
I've been playind Sand Castle since a week and so far it is pretty boring. I don't see what people like about it, you get sand, sand becomes to castles and you use castles to buy stuff. And it goes on like this forever. There is no depth in it (at least I haven't seen any). Maybe all they like is the feact that the image you can click changes every 30 minutes or so, creating a picture of a sandcastle that builds on and on.