There are a lot of bugs, like once when I was going to attack a castle, the on;y option available was 'Go'. I went past the castle, and was stuck outside..
Other than that, this game is decent and playable. It was pretty fun, besides the occasional bug.
I got all the badges..people don't pay attention...to kill the nightmare guy, just pick up the black gems he leaves behind. It is also useful to have the doublejump and regen power-ups.