Add bonus score for blocking each celestial (maybe?)

[mwcz]

related to #25

[Jared-Sprague]

Is this different than #25?

[mwcz]

yeah, for this one I was thinking that we could have a running multiplier for destroying any asteroid/comet (both barrage and strays). the more you block in a row the higher your multiplier gets. Just a thought to discuss!