Thanks for the input, I agree I would like more challenge, I might add a difficulty scaler so that the longer you are playing the iceberg spawn frequency increases...
As for the random death: it is supposed to be an endless scroller, but it was a mistake in my code for the icebergs.
Initially, they are all generated (at a fixed y position above window) with their x position, rotation, and scale randomly generated, but my RNG for the scale could go from 0.0 to 10.0, so that you could in theory hit an infinitesmal iceberg and die seemingly at random.
I have now set a lower limit > 0, so this shouldn't be an issue in the latest update - thanks for making me aware of this!