More cool games have shaken loose from the Ludum Dare tree. The Sun and the Moon is a free (obviously) puzzle platformer in which the puzzles are in the platforms. You play a small, er, dot thing, that can dive beneath the surface of the floating world's platforms. Do so, and your momentum reverses, causing you to 'fall' upwards.
Ludum Dare 29
More from the mammoth stockpile of Ludum Dare 29 entries: Vertico, created by Sebastian Janisz, is an isometric "three degrees of freedom" shooter, in which you dive to explore a vertically stacked coral reef. Along the way you'll meet a selection of ocean critters, and, like any good marine biologist, will shoot them to death. Er, it's for the best—a sinister obelisk is making them angry.