Negative points add the challenge of avoiding the penguins without killing them, making the game more interesting. You have to decide whether you can avoid the penguin (and risk losing a fish) or kill the penguin. I thought this was a pretty cool design :) Well, that's my view anyway!
Also forgot to mention: the platforming movement was a pleasant experience. My platforming skills aren't great, even so was able to enjoy this one. Well done!
