Try pressing the left and right arrow keys. See whether this will prevent you from falling on spikes. (Hint: it won't, but you can delay the inevitable for a while.)
This game was made in about 6 hours at the Austin Flixel Jam in Feburary 2010. My account of the jam can be found here. The jam was hosted by Phil Knoll, whose page can be found here. The full source code for this Flixel game can be found here. Enjoy!