The endgame is kinda easy right?

I just cleared floor 5 with level 50 characters and this just kinda seems too easy. I can almost clear floor 6 too. It just seems like it'll be too much of a breeze when we actually get level 80. But maybe its purposely easy because nobody has lvl 80 characters yet? i hope thats the case. Im just worried that the end game wont be a challenge. and thats mostly what im playing for.