Tidy up instruction pane formatting

Force a size on the instruction pane so that wrapping works properly.
Disadvantage: forcing a specific size.
Make player cycle color slowing when shifting
Tweak alpha values
Add particle effects on enemy death

Okay, I can't get the fade to work the way I want YET, so... needs tweaking
Get particle color fade working
Improved enemy death explosion particles
Add particle effects on goalstar pick-up
Allow play to continue after winning