If we put together these three hashtags on twitter over the next few days, I think it will be really effective:
#saveshenmue #10MillionToShenmue3 and #30onthe3rd
In your tweets try to succinctly explain what 30 on the 3rd will do.
Ie: "If everyone who has donated added $30 on July 3rd, we'd add over a million to #Shenmue3's #kickstarter. #10MillionToShenmue3 #30onthe3rd" that's under 140 characters, so go ahead and use that if you need to. I dropped #saveshenmue, but you could easily swap that with #10milliontoshenmue3.