Continuing on with my attempts to make a platform game, here's a work-in-progress. It has 10 levels of you being a totally generic non-copyright-infringing (I hope) jumping block. Use the cursor keys to move left and right, and space to jump. After the 10th level, the game loops back to level 1.
Libraries used: Bump (by kikito), for collisions; Talkies (by Tanema), for the message boxes; and Walt (by Davisdude), for animation.
The latest version can be found here.