Bugs I found:
1. In the last level, where Superman should spawn, there is instead another orange ninja (fox)turtle.
2. I eventually looted Cpt. America weapon (he doesn't have any). It appeared as a blank square, and now my equipment menu has a "new weapon exclamation mark" which won't go away.
I think it's a freaking awesome game, even though it has premium content, 5/5 for sure, btw, chill out, dudes, the programmers are supposed to get money with their games, so they're not doing anything wrong.
SECRET ENDING!!
in the last stage (with the white letters and stuff...) go all the way down but instead of going for the girl walk under the last phrase to to left, and enter the black wall
Good call! Fixed the achievement bug. Thanks.