Thank you gods, we have a mute button!
Now, for the negatives.
Controls were rather annoying, I would have rather jumped with the up key and flipped the world with space. That tripped me up a lot, I often would flip instead of jump or jump instead of flip.
Spikes didn't look spikey enough to me, they looked more like will trimmed bushes.
I often found myself trusting in you as a level designer, as I had to land on platforms that I wasn't' sure existed. If I had been able to see them, by virtue of a wider field of view, for example then it wouldn't have been a problem.
There was no way of returning to the main menu.The "Run" segment of some levels was very annoying. In the case of the sudden death level, I was on the verge of shouting terrible names at the stupid egg thing. By the way, the lack of story is disappointing, I'd like to know whay an egg is chasing me.
That SURVIVAL LEVEL was infuriating, after the first checkpoint, it was impossible to proceed. One second, dead, enter key, one second, enter key, dead, ONE DAMN SECOND, DEAD.
Needless to say, I ragequit after that point.
Your level design was actually very good. Apart from the egg.
Any other problems are pretty much non-existent in comparison to that egg.