This game would be much better if it weren't for the doors or the items to unlock the doors were in different areas. After the first couple levels the pattern is see a door and you can't unlock it. Then you go through an obstacle course. Then you find the item. Then you go back through the place you just got through but in reverse. Then gather the item or hit the switch in the door. Then you go back through the obstacle course because that is the main path to progress through the level. So you're retreading sections three times frequently. Otherwise a good game, but I just don't like that design decision.
