Every Extend Extra is pretty cool. But I'm not sure it's worth full price. More of a budget/niche title really.
Goku Makaimura is truly brilliant, and is an almost flawless modern sequel to a classic series. But I fear there's not a big audience to appreciate what it offers. But the retrogaming peeps will love it. It's oldschool made newschool, done right. Capcom really deserves praise from critics and fans for this one, because I don't think they'll get sales to match the game's quality.
Carnage Heart I know nothing about. It's a mech fighting game, right? Same genre as Armored Core? I'm not a fan, but I'll give anything a try if it's good.