way too easy. work on having to make your players think.
story is so bad you might as well have left it out.
good music.
animation is good, i liked how the background had little moving bits. art is pretty okay, if a bit simple.
gameplay is really unoriginal. do your gameplay portal style, introduce an element by itself, make the player practice with it, then layer it onto new elements. i think something that would have been pretty cool is screen flipping.
one minor gripe i have is that there's no button to skip to the next level which is pretty annoying if you're using arrow keys and x.
also the gravity flippers could use an arrow to indicate the direction you fall in