Fun concept, but the trampolines were extremely frustrating. First the treasure trampoline only worked maybe a quarter of the time (otherwise overshooting or undershooting the cauldron), and then the gnome trampoline never worked at all. Every gnome either didn't make it into the well, or overshot and clogged my cauldron. I had to stop playing after that upgrade because I was spending more time getting gnomes unstuck than actually managing my upgrades.
Also I had to play the download because the browser version constantly slid my cursor to the right.