use batchNode for walls
failed to use random lights volume (increase startup time => blanck screen)
update roadmap
try to display pageIntro ASAP
failed to add particle only on boost
doc: add number to help locate
add immobile ghost + collision (=> game over screen)
add first basic ia
only fps displayed
failed to try auto positionning of player to avoid blocking
change sound affectation,
customize ghost color and behavior (sometimes scatter)