JJWM -- Design Workflow & Testing
Long video.....
Here's the short form:
In order to give yourself the opportunity to learn a few basic lessons about level design you need to walk through the levels. Yes, actually walk your own game levels.
So, every time you complete a level (such as maze00) you test it.
Then when you are working on maze01, you test it.
Then when you are working on maze02, you test it.
Then when you are working on maze03, you test it.
Are you starting to get the idea?
Of course this means you will end up walking through maze00 a zillion times as you test maze01 and subsequent levels. This is as it should be.
Later (very soon) we shall give you the simple quick trip short-cut to avoid so much walking. Before that, get some experience.