Added new sprites for pink one and dark one.
Merge branch 'master' of https://github.com/MarkAZhang/impulse
Fix syntax errors...
Added dark ones to the tutorial.

At the moment, only available in God Mode.

Also modified tutorial levels slightly to accommodate dark ones.
Tweaked dark one dialogue.

Avoided dark one on 0-2 since confusion with void.
Added two new sound effects.

Dark anger might need to be improved.