Whoa.
This was awesome. Not much else to say about it. One idea I think would be cool is if the search escalated to Earth (for those who don't know Mario was a plumber in Brooklyn, New York). Like all these tanks and foot soldiers lined up and firing at Mecha Sonic and he's tearing them all apart one by one. Jets trailing him only to end up getting blasted apart. Buildings falling, people screaming, and possibly in the back ground you would hear evacuation alerts and helicopters, planes, cars, and boats rushing away from the city would be a good addition for like the tension of the search. One cool scene could be where one of the characters pick up a couple chainguns from helecopters and the character and Mecha Sonic are all going neck to neck, exchanging blows.