Sensory pleasure for everything but the hands
I like the Graphics and animation and sound. I think Nostalgia ensures that to be so. The plot was interesting to and seeing the variety in locations was cool. However I don't like the way the game feels.
Button Mashers have come a long way since Double Dragon and Ninja Turtles, however this game is lacking the joy and satisfaction of Punch and Impact. I should be able to shut my eyes and feel the enjoyment, at a finger tip level, of the game.
There isn't any rhythm or comfortably interesting strategy of attack pattern for my guy, just tap till it hurts.
Advance Guardian Heroes for GBA is the best example of a Brawler Beatem Up which demonstrates True isometric 3D gameplay in it's final evolution. In that game, You can effectively and comfortably hit enemies while enjoying the design of everything.
If not for the Nostalgia and smooth animation, I would have scored it lower. As it is, I am sticking my neck out for you with a NON-suck-up opinion. I offer this precious information and hope you take it into consideration for you next project.