We need more Golden Sun characters, and a vertex Isaac might be a good start, just think about it, there are so many hacks for other series like Pokemon and Kingdom Hearts. There are some Isaac textures for Link, Pit and even Ike but it's not the same (my port doesn't count, it's just... not good)
I don't know why in some stages when I jump to the right cloud kong just dies in the left part of the stage. Is a bug of your port? or is a bug of the stage?