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One of the levels (the fourth "yin 2 yang" level) is next to impossible to complete because it requires you to be insanely quick. So even when you know what to do, it's insanely difficult to do it. I'm not expecting feedback from the developer, so I'm just saying this as a warning to other players.
Also, here's a little tip: in the "throw to collect" levels, you can grab the ninja in midair. Makes those levels MUCH easier!
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theres a glitch on the throw to collect lvl with bombs.i completed it,hit a bomb,had to restart and i cant see the ninja.:(