I'm not sure why I'm the only one that I see mentioning this (not that I looked that hard :P), but I kept having trouble getting stuck in ceilings as I was jumping. I had to refresh the page several times to get unstuck, and at times, I immediately got stuck again in another spot haha. Other than that, this game is really awesome and addicting.
 "Elephant Quest"){kind=icon}
 "GeoSketch"){kind=icon}