You can move the circles around after hitting play. Best thing to do is just hit play, then push the red ball to the key with the circle. Not sure this was intended.
I think Kong needs a seperate section for demos and test games. I don't mind seeing or even tryng them out from time to time, but it would nice to have them seperate from the complete games, or even complete demos.
Best thing to do is ignore all the bananas, then get them all in one sweep. Then you only forefit the bonus on the first one. A friend of mine killed all monkeys in Large mode, took them four hours, about 5,000 monkeys. (and there was no save or pause option at that point!) Too bad that most likely won't turn into a "Monkey Massacre" badge.
Getting pushed though walls is a "feature" of the method I used to make sure objects aren't interpenetrating. It works most of the time, usually only comes up after you are already dead.
 "Crashdrive 3D"){kind=icon}
 "Physics 1"){kind=icon}
 "Vishwamitra"){kind=icon}
 "Luigis nightmare"){kind=icon}
 "Zelda RPG: (demo)"){kind=icon}
 "Many Worm v1.1 Flash!"){kind=icon}
 "Rama Shoots"){kind=icon}
 "Flash Asteroids"){kind=icon}
 "The Sand Man Defends Sand Land from the Monkey Horde of Doom"){kind=icon}