Very nice programming, great music, good difficulty and lovely art design.
I do find it odd that you are rescuing so many cubs when there weren't that many in the beginning, but I will suspend my disbelief.
There are some problems that I would like to address, first off all the music keeps playing when you pause the game, which can get slightly annoying, secondly there is no quick mute sound nor music, such a function would be nice. And though I love the art style you went with, it would be nice if the character and the cubs more clearly. Also the water looks shallow which tricked me a couple of times, but not really an issue.
Over all great game.