There are a few glitches for example the some of the backgrounds were out of order. I also think there should have been a few more tools to make the game more interesting (Enemies) as well as better animation.
I was sooooooo annyoed when I was making my captain america (I'm not american or anything,his just awsome) and I went to click "Undo last" but went for the "Erase all" button which was pretty darn sad. If you think it needs a general undo button thubs up :D