This 1986 release from Anirog is seen as something of a ‘killer app’ on the Commodore 16, although personally I think it’s over-rated.
Tom Thumb is a smooth-scrolling platform game with a strange jump mechanic: Tom can only jump when the run button is pressed, and when he does it’s very slowly. Thankfully you can change his direction in mid air. Not that that makes a great deal of difference, because Tom Thumb is an extremely difficult game to make progress in.