the design is great, only one thing that's strange is that the overall level takes part in this "hole made of walls".
Maybe you can hide this border by building it into the level as it is done with the station-like thing on the first screens instead of using it as plain border.

I know this is not easy, but I think it's worthit.

Nevertheless great design!






My project Schlacht um Kyoto - Das Samurai Browsergame! (sorry, german only)