I'm a little bit indecisive on how I should score your game. I was actually going to give you a lower rating because the random jump key changed extremely fast at times (I think once, it went through three keys in less than two seconds). However, I noticed that there was some kind of pattern in these changes, going from a period of changing fast to changing slow. I liked it because it kept me on my feet and kept the game from getting boring, but I have to look down at my keyboard to see where the keys are (I type with one finger and don't have their position memorized) and a few times I've looked up to find my duck about to go off screen and the key changed so it is both good and bad for me.
Still, a good game with a good concept behind it.