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Rainbow Firestorm Longwise Edit

For dual screens, this is an edit of the original codepen with a few new features:

- Each obstacle now has an individual hit counter, initialized with a random value. Once this counter hits 0, the obstacle is instantly respawned regardless of its size.

- Gravity now runs from left to right instead of up to down; the right border respawns particles.

Matei Copot wrote the original, I've heavily edited this copy.
Source: http://codepen.io/towc/