some little improvements

Improvement since the last build:
Running down slopes works a bit better
Parallax Backgrounds
Wall Jumping now gives a little "kick" back when pressing against the wall.
Training Park added instead of Clowder Canyon as the starting stage
stub menu-scenes added, with skip-option

Next, probably the Winsome Illusion Dash, although it might be nice to have at least one playmate on the field to use it on first.