The programming seem a bit wonky.
I'm constantly missing coins by mere millimeters, and sometimes the key brushes the coins but doesn't register a hit. It's kind of frustrating. The cutting mechanic seem a bit spotty as well, pretty much having a life of its own and deciding regardless of your input when to actually successfully cut the chain or not.
All in all, a decent game; barely competent, though I think I'd recommend Cut The Rope over this, sorry.