My only gripes with this game are the fact sometimes it's took dark to see anything (that could very well be a problem with my TV though) and the boss lineup aside from Ridley and the final boss. I would say the backtracking is also a negative but part of what makes metroidvanias so special is going back to previous areas and discovering new things with the new abilities you've acquired and this game was full of that. Other than those possible shortcomings, this is one of the best Metroid games.