Silver Star Japan has a 3DS game that looks like a homage to Mega Man that takes place in the 20XX. You have to save the world from the evil Black Halas organization, but you won’t have an arm cannon or any kind of firearm.
Super Throwing Warrior! Nagerunder’s hero uses his arms to grab and fling things at enemies. Hitting enemies with objects sends them flying. If you’re fast you can grab a falling enemy and lob it at another adversary to create a combo. Nagerunder’s power is kind of like Gutsman’s ability from the original Mega Man mixed with aiming system from the Yoshi’s Island games.