a nice piece, needs work tho
the gameplay is nice, alot of alternation and stuff, but the framerate is awful! make it running at least 24-30 fps. and the falling objects.. i think you should shape them so you'll have to touch the actual shape or texture and not the bounding box of it.
it also needs sound effects, for all the buttons used and animations like moving spike walls ;)
work on it, update it, make it batter and get more score and players ^^