Lots of things you need to fix...
When someone does an attack, you dont just stand there! That bugged me a lot. And the red hot combo took forever and nothing even happened. Mario was up in the air and never came down, where did he go? Bowser took forever to stop... These things annoyed me... Fix them, make it more fast paced, and you got it in the bag. Maybe add some voices or make a plot? Its not like Madness or anything because that is ussually really cool that it doesnt even need a plot. Yours might...