Honey Tea Time

There's an issue with this map - you're using wall tiles as ceiling tiles as well. You'll want to get a ceiling tile and surround the wall tiles. Here's an example of what I mean:

The green dots are ceiling tiles, the yellow dots are wall tiles. Ceiling tiles can be mix and matched with the wall tiles, but they do have certain ones they work best with. In this case you're using wall tiles as ceiling tiles AND wall tiles, making it look rather awkward. Hopefully this gives you an idea of how it works.