"The Quest of the Incrementalist"

An experiment of building a classic 2D game from the ground-up, by very small increments, based on simple user-stories.

The main idea is to make a playable game at each step of the development session, which will probably never end.
Every iteration will bring a new simple feature, like moving hero, collecting coins, providing a pause menu, score count, etc.

Here is a list of potential "user stories", from the very first steps :
 X Hero is centered on the screen.
 X Hero move to right or left while player press the right or left arrow.
 X Hero is blocked by the screen edge.
 X Hero look at left or right when moving to left or right.
 X Hero fall until he's blocked by something.
 X Hero change position when acting
 X Hero animate when moving.
 - Level is composed by platforms.
 - Hero can walk on platforms. 
 - Level is composed by walls, too.
 - Hero is blocked by walls.
 - Hero can jump if player press up arrow.
 - Level contains background decorative plants.
 - Level contains foreground decorative plants.
 - Level contains animated gold coins, anywhere.
 - Hero can collect coins.
 - Hero count collected coins.
 - Level has music.
 - Level contains others characters.
 - Hero is hurt if he touch the others villains characters.
 - Hero restart level if he loose to many HP.
 - Hero can kill villains with his staff when player press space.
 - Villain can patrol on a platform.
 - Villain can move outside the platforms.
 - Hero change level when collect enough coins.
 - Player see the end screen when he finish all levels.
 - Player see the start screen before starting to play.
 - Hero can kill villains if he jump on their head.
 - Level can be bigger than the screen.
 - Hero can throw fireball when player press ctrl button.
 - Level can contains scrolls.
 - Hero can collect scrolls and throw fireballs one time by scroll collected.
 - Villain can give a coin or a scroll when get killed.
 - Hero can push some walls.
 - Walls are affected by gravity.
 - Moving platforms can transport villains and hero.
 - Level can contains doors and remote triggers.
 - Hero, Villains and Walls can open door when posed on the trigger.
 - Hero can go up and down small stairs.
 - Hero can be transported thru teleporters in same level.
 - Hero can be transported thru teleporters in other level then come back.
 - Player can use a joystick instead of the keyboard.
 - Player can play in full screen
 - ...