I know it may not seem like a big deal; but i'm amazed that they even put in the effort to have the characters realisticly blinking randomly. These people are truly dedicated!
All you need to do for level 30 to prevent the foes taking the middle shortcut is remove the right corupted tile and place a tower with upgrade slots on the bottom left and bottom right to close the opening between the portals.
One of the devs must have played dungeon explorer, westaria is westria with an extra a, two of the races are represented by a male and one by a female, and the main enemies are necromancers and undead, even the slow corruption seems to represent what happened with glorios.
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