Yeah cool game with an interesting mechanic...going along w/previous comment, you might try wider gaps at first. Also, you might try switching the buttons, so that "a" causes egg to go left and "d" causes it go to right.
Yeah, actually I'm planning on making a "story mode" with levels that have a gradual difficulties (like you said wider gap first :D), for this "arcade" mode I'll stick to easy-hard option. For the switch button, I think you're right, it's a good idea to put switch buttons on the game setting menu, but first I should make a setting menu firsst I think. I'll working on that.
Thanks for your suggestion Peter! :D