Not a bad try but I would like to have the ability to move in all directions like in most beat em ups. And you should have some invincibility frames when you get up from being knocked down so that your not knocked down again soon after getting up.
I don't mind paying but only if it has multiplayer. The internet has many free games just like this (even a few on kong.) Next time add ONLINE multiplayer co-op and head2head and maybe people will be more willing to fork over money.